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I'm fairly sure I've seen this come up in threads in the past, however it would appear that my memory and the search feature are not in agreement on this. If someone has better search-fu than I, please post a link to the successful search here. If nothing else, it'll make it easier for others to find with an obvious title like this.
So, onto the question. How much anti-tank is advised in a list? This of course depends on how many points you're playing with, what armies are being played, and your overall composition.
So to reduce the number of variables, let's assume we're working on a take all comers list. I have Space Marines in particular in mind for the side 'we' will be playing, but if you have a more general rule of thumb that would be applicable to other armies feel free to share that as well. A lascannon and a brightlance aren't all that different, after all. I don't have any particular point value in mind, but if you really need to stick to one let's just go with the tournament standard 1850.
I've read a few pages of army lists and this is what I've been able to work out so far. Around 1000 points people seem to be okay with around two or three heavy anti-tank guns and a similar number of light anti-tank guns. Something along the lines of a TLLC, maybe a heavy weapons tac squad with another lascannon, and then a few plasma and melta weapons scattered about. Around 1500-2000 points, the numbers increase by slightly more than double.
With my BA's at 1500pts I have 4 Lascannons backed up by the all-purpose assault cannons and various power fists.
I would probably recommend a minimum of 1 Lascannon per 500pts but also try and provide backups like assault cannons with the odd power fist/melta gun for those close encounters, I suppose on what style of army your playing determines what type of antitank you may require.
What type of marine list will you be fielding?
Personally I'm going to be fielding Black Templars. So no Devastator Squads, but other than that the options are pretty much all there.
I suppose being Templars I would recommend Tornado speeders as they'll clear out Infantry and also be capable of taking out heavy armour, there also great at grabbing objectives at the last minute.
If your taking assault squads obviously hidden PF Sgt's are a must with the zeal rule they'll come In handy.
Also possibly twin-linked LC razorbacks could also be an option with a 5/6 man squad with LC's don't use them myself but they look good on paper.
Being templars you might be tempted by the normal LR's but I'd go for a crusader every time, again the Ass-cannon can be fired on the move using Machine spirit making one mean anti-tank weapon
I know bike squads can take 3 x PW's If they can take 3 x PF's that could be nice with melta-bombs added In?
I suppose your next step might be to post up an army List to show us what style of templars you had In mind this will make It easy for any of us to help you on your way.....
Sadly our assault squads are not subject to Zeal, only regular Infantry are. Still, jump pack troops are nothing to sneeze at. I'll probably have a list put together sometime in the next day or so.
I was also hoping to keep this a bit more general than just how much anti-tank I should take myself for one particular army. Ideally it would be nice if it would be a nice little thread that people could find if they did a search and have some condensed advice. A sort of a precursor to a tactica thread if you will. For the ages. Something like that.
...I need to take ArcGIS training more often. I get to spend the day goofing off on forums.
I generally take one or two lascannon tactical squads, and sometimes 8 man dev squads with 4 missile launchers if I know I'll need the krak missiles. If I take a predator it usually gets an autocannon to take out infantry and light vehicles along with heavy bolter sponsons. And of course meltaguns in the tactical squads with power fisted sarges, though I use them more for anti infantry than vehicles. Dreads are kind of a toss up for me at least, you're either going to go with twin lascannon and a missile launcher, or assault cannon and drop pod it in, I normally go with the assault cannon.
In a 2000 point list I'd probably run one or two 5 man tactical squads with a lascannon, 8 man devastators with either missile launchers or heavy bolters (not really anti armor, but I'm more focused on anti infantry than anti tank), and my choice of a heavy support tank; sometimes a predator, every now and then a vindicator, but most of the time a whirlwind. I'd usually take around three 10 man tactical squads with meltaguns and powerfisted sargeant. A plasma gun can also work for anti armor, but I use the trait "take the fight to them" so a rapid firing plasma doesn't mesh to well. My army is probably off from the ideal, but to me tanks are either easily destroyed or avoided, or such a pain to take down that you're practically better off ignoring them.
I can read now!
Well in a 1000 points i usually only have too small tactical squads with lascannons for anti-tank.They usually do the job pretty well.But occasionally i might add in a ML and a dread if i need alot of anti tank.
Dark Eldar - 2 Dark Lances, 2 Agonizers, Talos (basically a beefy powerfist)
Dark Angels - 1 LasCannon, 1 Assault Cannon
Ultramarines - TLLas, ML, PowerFist, Melta Bomb
Dark Eldar - 4 Dark Lances, 3 Dissintegrators, 3 Agonizers
Dark Angels - 1 LasCannon, 4 ML, 2 Assault Cannons
Ultramarines - 1 LasCannon, 1 TLLas, 2 ML, 2 PowerFists, Melta Bomb
Dark Eldar - 5 Dark Lances, 3 Dissintegrators, 4-5 Agonizers, Haywire Grenades
Dark Angels - 2-4 LasCannons, 1 TLLas, 5ML, 4 Assault Cannons
UltraMarines - 4 LasCannons, 1 TLLas, 3ML, 2 PowerFists, Melta Bomb
War Record Since Sept 2005
Old Codex 48-20-9 Dark Eldar
New Codex 1-0-0 Dark Eldar