Well for HQs you could use Daemon Princes, Sorcerers maybe a Lord (although they probably aren't very useful), Elites you could have Terminators, Dreads (FW one is quite nice), maybe Chosen. Troops, 1K sons mainly, although Chaos Space Marines could be an option. Fast, Raptors are your best bet. Heavy, Obliterators (you could probably manage some nice conversions), maybe the other tanks. Its up to you really, depends on your conversion skill as well. I would recommend using Lesser and Greater Daemons though, they are quite effective, and you can make nice lists with them in, but they are by no means necessary, and if you don't like them then i suppose you can make do without.
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