Playing around with the Chaos Marine book some more, tinkering with the list ideas I had for the Endless Ones.
I was going back and forth on some options, like whether to run bikers or raptors, and ended up deciding to just make them both and swap them around as desired. I went further down that line, coming up with some things that could provide a good baseline, with a few swap options and some different options to take things up to higher points levels.
HQ - Sorcerer, level 3, jump pack, meltabombs, sigil of corruption, spell familiar - 170
or Sorcerer as above but on bike instead of jump pack and melta bombs - 170
Run with raptors or bikers. I think I'm currently leaning towards bikers for possibility of Invisibility + jink. Spell familiar for perils protection; lots of Eldar trickery in these parts.
Troops - 10xCultists, flamer - 55 (x3)
Cheap scorers, probably frequently in reserve to walk on to objectives near my table edge.
10xCSM, +CCW, 2xplasma guns, Icon of Vengeance -215
10xCSM, +CCW, 2xmelta guns, Icon of Vengeance -205
More solid midfield scorers. I'm still pretty leery of icons in 6th with sniping possibilities, but will hopefully let me ignore the first few checks. At present leaving champs bare, hoping the extra attacks from the squad in general will pay off more. Will make some extra power sword figs to swap in if points allow. Potential to drop icons for Rhinos at +10pts/unit, but think will try without Rhinos at first to avoid giving away First Blood as easily.
10xBikers, 2xmelta, champion melta bombs, power sword, Icon of Vengeance- 275
12xRaptors, 2xmelta, champion melta bombs, power sword, Icon of Vengeance- 279
Escort sorcerer, get to enemy's side and cause problems.
6xWarp Talons, mark of Tzeentch - 226
More jumpy guys, marine killers. Not always in list, sometimes swap in in place of defiler.
7xHavocs, 2xML with flakk, 2xautocannons - 171
Fire support, some anti-flyer capability. I love the quad-gun, but since it doesn't join the unit firing it, it's just so vulnerable if the enemy has long-range power. The havocs are basically the same cost as Aegis+quad gun+5-man CSM squad, and I think the havocs probably degrade more slowly, keeping their firepower longer. Interceptor sure would be nice though! Hopefully in some lists I can have both.
Predator (autocannon), lascannon sponsons - 115
Defiler, dirge caster, power scourge - 225
Fire support and big scary distraction. Probably charge up behind bikers/raptors, use cannon to help clear the way and then charge leftovers if still alive.
5xTerminators, Chainfist, powerfist, heavy flamer, 2xcombi-melta - 196
+dedicated transport Land Raider, dirge casters, havoc launcher - 247
Mostly for when bump list up, thought terminators might be drug in at lower levels from time to time. Another element to throw at enemy, probably leading the way with bikers/raptors behind the raider.
Sample 1500pt list
Bike Sorcerer 170
Bike squad 275
CSM plasma squad 215
CSM melta squad 205
+Veterans of Long War for Havocs 7pts
+Warpflame gargoyles for Defiler 5pts
+Jump pack sorcerer 170
-raptor champ meltabombs -5
+3rd cultist squad 55
+Terminators and Land Raider 443
+3rd cultist squad 55