I have found 2 squads of Plague marines (toughness 5 and feel no pain ... ouch!) and a good squad of Khorne Termis is a great core to build around ... oh and make the termis all champions (5man squad with 1 Chain fist and the rest with power weapons/Ranged weapons to taste) and deliver them on the field with a land raider. Think of all the melee destruction Champion Khorne Terminators have. Attacks=4 attacks each base plus 1 for assaulting x5 man squad= MASSACRE!
Include Typhus (for the force weapon) and a Demon Prince of Nurgle with Wings, one tough sucker from the warp (ok I'm slanted toward Nurgle a bit
) a Defiler and presto, you have a starting force which can take on a variety of foes. Now you can stick to those Corpse God worshippers!
This is one of many ways of doing a chaos list, I presonally like fluffy lists vs tourny lists. Which is why I probably dont win tournys and come away with players choice awards sometimes
All the chaos gods have something to offer your playing style ... now dont get me start with Thousand Sons and their AP3 bolters ... can you say toasted marines!!