OK, I'll bite but there are others with more experience than I so please take mine as an educated suggestion and perhaps spark the others into posting their thoughts as well.
HQ
(8 infantry, 1 vehicle) @ 361 pts
Archon with shadow field, agoniser, splinter pistol
Haemonculus (The guys with poison blades and flamers in old book)
6 incubi, 1x shredder, 5x S4 power weapon and pistol
Raider with disintegrator.
(2 infantry) @ 70 pts
2 haemonculus with poisoned blades and flamers (one with wyches and other with raider squad)
HQ is rather expensive at 361 points, some would say its too much at 1500 points.
The Archon looks good with equipment - some would say to downgrade to a dracon especially if you have a retinue and another HQ. The incubi are mighty powerful and in essence a meatshield - whats the point of a shadowfield? Use up the incubi for wounds, use their power armor.
The incubi seem fine except for the shredder and they can take punishers (they're free!). I run them in a squad of 5 when I use them and with an Archon (or Dracon) you can take a squad of 10 marines easily. Kill off your target too soon will leave you in the open to be fired at. The idea is to leave 1 or 2 alive when your turn ends so your opponent can't fire at you. Ditch the shredder, the punisher is much better and the shredder, I think, is the worst assault weapon they have - keep the punishers on the incubi.
The Haemonculus are used in my army to deploy the wwp (web way portal). Some would say that other than that they dont make their points back. Personally, I like to have one but he is an easy target - prepare to only get one shot off so you better get alot under that template.
As for the disintegrator on the Raider, unless I know who I am playing I usually leave it as Dark Lance and save the points for something else. I see you have some sniper squads so perhaps having the dissies is ok.
Elites
(9 infantry, 1 vehicle) @ 146 pts
8 wyches, 7x pistols and CCW's, 1x shredder
1 succubus with power weapon
Raider with dark lance
(Haemonculus, so 10 infantry models total)
Number of wyches is fine, their load out, not so fine.
Add wych weapons to the ccw and splinter pistols. Ditch the shredder and trade in for the Blaster. Not only is the Blaster cheaper but it is a mini Dark Lance! I take 2 blasters in my squad and the strategy is to get 2 blaster shots then assault. 2 strength 8 shots will vaporize a marine - 3+ to hit, 2+ to wound and no armor save and an insta-kill for those with more than 1 wound. Blasters can also be used to pop tanks - shredders cannot do any of these things at all. Also give the succubus an agonizer and wych weapons. The idea here is the succubus get 3 attacks on the charge and gets 4+ to hit, 4+ to wound (any toughness) and no armor save. Yeah, it costs more but definitely worth it.
Troops
(10 infantry) @ 120 pts
10 warriors, 8x splinter rifles, 2x dark lances
(10 infantry) @ 120 pts
10 warriors, 8x splinter rifles, 2x dark lances
(8 infantry, 1 vehicle) @ 155pts
7 raider squad, 5x splinter rifles, 1x splinter cannon, 1x shredder
1 sybarite with power weapon and pistol
Raider with disintegrator
(Haemonculus so 9 infantry models total)
The 2 sniper squads are fine but they're 100 points not 120. The raider squad is fine except I see that cursed shredder again, are playing against cheese? Is that what the shredder is for?:w00t: just kidding! Change the shredder to a blaster for the same reasons above plus its cheaper. Don't worry, they are both assault weapons. Give the syb an agonizer with the points you saved on the shredder switch.
Fast Attack
(6 jetbikes) @ 197pts
5 reaver jetbikes, 4x splinter rifles, 1x shredder
1 succubus with power weapon and pistol
Dam shredder again! Switch that to a blaster and get another one for a total of 2 (same reasons). Succ looks good too.
Heavy Support
(1 vehicle) @ 105pts
Ravager with 2x brightlances, 1x disintegrator
(8 jump infantry) @ 224pts
7 scourges, 4x splinter cannons, 3x splinter rifles
1 Sybarite with power weapon and pistol
Ravager looks good except they're Dark Lances (opposite of Bright) BUT I like the 1 Dark Lance and 2 Disentigrators load out better - reason being is if you move more than 6" then only 1 of your 2 Dark Lances can fire and the dissie fires in secondary mode. With the one I suggested you get to fire all your weapons (1 main and all secondary weapons if moved more than 6"). As a further suggestion, consider the Talos model as well. Ravagers are frail and fast, Taloi are tough but slow. Each are worthy selections (I like them both equally) but I can see you are building a rooty tooty fast & shooty list so perhaps not a good choice here but consider them in the future
As for the Scourges, I can't help you here. I can't say I dont like them because I have never used them but I have been told that they aren't good at getting their points back (in other words, they're expensive). Most people dont use them although they are one of the coolest models. Hopefully someone here can give you some guidance or opinion on them.
I like to use the web way portal for points over 1200. For me, putting 1500 points on table or reserves isn't worth it, the raiders will get shot up and take heavy casualties. The WWP helps you catapult your raiders into CC in which I think the DE excell.