Welcome to Librarium Online!
Do you have an army that does particularly well at tournaments or your local club? Post the list please to help noobs like me build our armies.
In particular I'd be interested in seeing how people deal with t6+ guys like treemen, sphinxes and tooled-up heroes in their all-comers lists. I know we have the tools to take out anything, the trick is putting all those elements into one cohesive list to create a mean purple/pink/red/green killing machine.
It is less that I have 1 super tuned list to rule them all, as I have units that have been tuned towards specific tasks. Some of these get fielded with such regularity that they have developed names of their own. For instance, I think I was the first person on here (although I very well could be mistaken) to refer to the unit of warriors (XHW, FC, MoN, Banner of Rage) attached to Festus as the "Will It Blend" (about the only things that don't are character Monsters). This unit chews through everything, but does exceptionally well against units that have tons of cheap bodies that are crappy (goblins, halberdiers, Skaven Slaves, etc), as well as high toughness monsters thanks to the auto-wounds.
I also love to run Throgg and his Drinkin' Buddies (5-9 trolls). It is a beatstick unit with a pretty small frontage (and thus allows for easy maneuvering) that can kill damn near anything, provided that they survive to their initiative order. The things that worry this unit are hordes of Iron Guts and Dark Elf witches with the Banner of Eternal Flame. But units with overwhelming numbers of attacks+ flaming attacks, it is a great unit.
Also, depending on the size of the game, I bounce between two disk mounted characters. For smaller games (1500-2000) I like a Chaos Lord with rending Sword, Helm of many Eyes, and talis of Pres. Hardly original, but fun nonetheless. I also like my "450 pt sorcerer jerkface:" lvl 4, Mot, Disk, Talis of Pres, puppet, ch. sheild, Roar, and 3rd eye. He floats around stealing whatever spells my enemy has that I want and taking pot shots at monsters, warmachines, and lone characters with Roar. He is only game breaking when he steals some awesome spells, but he pisses people off so much that he often receives more attention than he really deserves.
Those are the main things that I have tuned. Lets face it, 50+ marauders with MoK and GWs hardly requires tuning to be stupidly powerful. But ya, when I am building a list, I just try and fit as many of the above in as I can, plus up to three Hell Cannons, magic to fit what else I have, maybe a Horde of MoK Warriors with Halberds, a lvl 4 Shadows sorcerer, and maybe some Dragon Ogres or Knights. But those are my "go to" units
It' a bit hard to put up a 'strong' list. You really need to know what to do with it. Anyone can pick up a list but it's the best tacticians that will carry the day. One trick I've done to improve my own game play, my own lists and also my mates is to swap armies after a game. If you play your own list then you learn to counter it and knowing your armies weaknesses and how the enemy can exploit those weaknesses lets your improve your tactics and your army list. As for your friends it lets them do the same and sometimes they'll se you use tricks they've never considered with their list and likewise with yours.
I rarely go to tournaments as I don't really like competitive environments. Anyway, here's a fairly easy to get to grips with 2k list.
Sorcerer Lord, Level 4, Infernal Puppet, Charmed shield, Necrotic Phylactery. 
Lore is up to you. Fire is easy to get to grips with as it's a blasty lore. Tzeentch is the same. Shadow is probably the better all round Lore.
Exalted, BSB, MoT, Preservation, Halberd. 
Plain and simple. A good fighter. Tough and useful.
18 Warriors, MoT, Halberds, Musi, Std, Banner of Rage.  You could swap these guys out with a unit of 60 Khorne Marauders with Great weapons.
18 Warriors, MoT, Shields, Musi, Std, Banner of Flame 
3x 5 Dogs [xxx]
5 Knights, MoK 
5 Knights, MoK 
Hell Cannon [xxx]
Leaves you 44pts to spend on goodies.
The list I would use in a tourney would be:
Sorcerer Lord, charmed shield, talisman of preservation, Infernal puppet, ironcurse icon, shadow
Exalted Hero, BSB, talisman of endurance, spellshield, MoT, halberd, chaos steed, stream of C.
Festus, the Leechlord
18 Warriors, shields, MoT, full command, lichebone pennant
18 Warriors, shields, MoK, musician, standard bearer, halberds, banner of flame
50 Marauders, MoK, great weapons, full command
9 Chaos Knights, MoT, blasted standard, musician, standard bearer
One of the toughest lists I have, I don't use it in friendly play, but should I enter a tournament I definitely would.
I like that list Noma. The Core, Special and Rare choices are very similar to what I've distilled down as an optimal list for myself.
I've theory crafted 2x6 knights with MoK. Frenzy can end up taking them out of the game for a turn but that's why I have 2 units. Why have a unit of 9 (assuming the bsb goes in there), isn't that overkill and aren't you losing a lot of attacks from the back? do you run them up the middle?
I can't really explain why it's optimal for me, but since I started running a unit of 9 with my BSB they have just been a solid hard hitting unit that can deal with a lot. They have a 2+ armor save 4+ ward against shooting and a 5+ ward against magic, overall tough as nails and with an extra rank they can pretty much handle anything.
I usually run them up the middle, or depending on my opponents deployment there might be an opening for them I just can't pass up.
This reeks of "netlisting" to me, which is something that I really do dislike. Coming to the forums to get opinions or helpful tips is fine - it's encouraged, and it's why we're here - but I firmly believe that an army that you build and test by yourself, and tailor to suit your own playstyle, is going to out-play anything that we can simply show you on here. But, since you seem to have the good intentions of looking for a common theme and getting some tips on how to make all of this work, I guess I could throw you a bone and hand over not one but two of my own lists for your perusing pleasure.
This first list has been my list since 8th edition was released, and it isn't much different than the 7th edition list that I collected when our armybook came out. It finishes in the top 25% of all the local tournaments, it's high-water mark being a 2nd place victory in a major local tournament, and a 1st place victory at a small "bookstore" run tournament which netted me a free battalion box (subsequently sold for cash).
Lvl 4 Sorcerer w/ Lore of Shadows, Infernal Puppet, Talisman of Preservation, Distendable Maw -390pts
Standard "Shadow Caster" with a nasty trick. If he ends up in a challenge, he nerfs the enemy regiment's inititative and then "eats" the challenger using Maw. This actually worked for me on a few occasions.
Exalted BSB w/ MoT, Sheild, Book of Secrets (Fire/Death), Dispel Scroll, Third Eye -220pts
This guy is why the Chosen do not carry Banner of Rage. He joins them and has a 5+ Parry thanks to HW&S+MoT, saving points on an item and allowing him to tote the Book and Scroll, with a +2 to cast and the option to cast opponent's spells. I alternated him between Lore of Fire and Lore of Death, Fire because it's easy to cast and can add a little damage if there are no good 3rd Eye Options, plus it gives the possibility to gain Flaming Sword for my Chosen.
Wulfrik the Wanderer
Festsus the Leechlord
Festus joins the Chosen as well, or the Marauders if they start on the field. In the Chosen, he typically creates the "Will it Blend" unit, and his poison is what allows me to take on much tougher opponents. His guaranteed Curse also works in unison with Shadow's "Enfeebling" or "Withering" to nerf a foe down to 1 and then Curse them to 0 in a single turn, killing entire regiments. The most models removed in this way was a 100 man unit of Clanrats pushing a Screaming Bell, plus the Grey Seer on top.
15 Warriors w/ MoT, Shields, Musician, Standard Bearer -278pts
14 Warroirs w/ MoT, Shields, Musician, Standard Bearer -262pts
This unit escorts my Sorcerer Lord, always drop a model to save points. These two units together work on my flanks, and are "Okkam's Targets" or gain their combat edge with Shadow hexes. I can rely on them to hold an enemy in place for quite a while, until I can free up a caster to come in and bail them out.
23 Marauders w/ MoS, Great Weapons -125pts
Originally these guys were MoK'd, but I found that they would fail their Ld and charge into the back of a useless archer regiment or soemthing when they entered play with Wulfrik, so I went with MoS so that the enemy still couldn't turn around and panic them off the field. I usually charge Wulfrik out of the unit and into the enemy bunker, calling out their general and killing him. The Marauders couldn't hope to make a dent against that type of unit, even from behind, so they charge off separately to hit warmachines and missile units. This is my anti-gunline defense. They can also start on the table, swapping Wulfrik for Festus's place in the Chosen unit.
16 Chosen w/ MoK, Shields, Halberds, Full Command, Wailing Banner, Favor of the Gods -455
The Wailing/Favor is actually pretty stupid, I wound up dropping this unit in future lists, but it's still a standby for most people, which is why I left it in for you to see. Typically they miss the 4+ Wardsave but are guaranteed either +1sv, +1S/T, or +1A, which I will take depending on who I'm fighting. With Festus in their midst, they are utterly brutal in CC.
Warshrine w/ MoT -150pts
The "tarpit for my tarpit". I deploy this guy on the flank of my army that I expect to find itself most exposed - usually because one of the MoT units is expecting to outflank the enemy itself, or my whole army is charging at a slant to engage one flank of the enemy, leaving me exposed to the center. I can trust that a 3+ Wardsave will keep this guy in the fight for a while, so I use him as a shield.
This goes on the opposite flank of my Warshrine most games, because I either want him to help a MoT unit turn the enemy flank, or because that is the flank that I am anchoring for a refused flank. A flank charge by a hellcannon can turn the tide for that little MoT unit even without needing Okkam's or Hex attention from the Lord.
Total - 2500pts
List 2 - I started playing this list only recently, because I wanted to try the larger units that I had been neglecting. I think it's wasteful to have 2 ranks of very expensive Warriors standing around doing nothing, but my original list was having a lot of difficulty with enemy units who had profiles similar to my own (Saurus for example) and came in greater numbers. I shaved a bit from the army and boosted the unit sizes, and this list seems to do more than just "ok" for itself. It's not quite tuned yet though. A lot of the tactics for the units are the same as their smaller counterparts in the list above, so they won't need explanations.
Lvl 4 Sorcerer w/ Lore of Shadows, Infernal Puppet, Talisman of Preservation -350pts
Exalted BSB w/ MoT, Halberd, Shield, Book of Secrets (Fire/Death), Third Eye -200pts
Festsus the Leechlord
22 Warriors w/ Halberds, Shields, Banner of Rage, Musician -427
20 Warriors w/ MoT, Shields, Banner, Musician -358
19 Warriors w/ MoT, Shields, Banner, Musician -342
5 Chaos Knights w/ MoT, Blasted Standard -280
Warshrine w/ MoT -150
Total - 2,497
Whilst upon the throne I had a thought. I did a thread where all the peeps here put up the lists they used. Maybe you should have a look at that?
Linky (The list(s) you use.)
Great thread Lord Borak. I need to dig around the forums a little more. I'm sure there are more then a few gems like that hidden around here.
Captain Sarathai - isn't Wulfrik a bit of a crapshoot? I've read a few bad things about him, primarily showing up too late and not being able to charge when he shows up. Also, the warrior and marauder units seem sort of small - I'm guessing if it's an anvil you don't really need more than 15 to take a hit?
I took all the great advice and good ideas from the forums here for a minor victory this evening against Dark Elves. Posting a short summary on my Army list post.
Cap'n: Glad I'm not the only one who feels that way about using completely unmodified lists off the web. To me playing against a list like that isn't playing against a friend or anything, but playing against a computer.
Though like you said, there is always a way to get advice and modifying it to your own circumstances, and that's why I love these boards so much