I've been toying with an idea for my Khorne Daemonkin... Here's a rough outline of a 2000 point list:
Lord on Juggernaut, tooled up
Bloodthirster of Insensate Rage
6 Bloodcrushers, full command
16 Bloodletters, full command
8 Berzerkers, chainaxes
8 Cultists
8 Cultists
5 Chaos Spawn
5 Flesh Hounds
Maulerfiend
Maulerfiend
Soul Grinder
The Lord would run along with the Bloodcrushers. The Bloodcrushers, Spawn, Hounds, Maulerfiends, and Bloodthirster all move 12" a turn, with minimal or no penalty from difficult terrain to slow them down. Cultists are sacrificial lambs who could possibly hold objectives (this all fits into a CAD), Bloodletters can hold an objective or rip apart Marine units in combat, Berzerkers are a sturdy unit who can rip up anything short of power armour in combat. Soul Grinder is some fire support that also lends some punch in combat.
The basic idea would be to rush the enemy with as much as possible, getting into combat on the 2nd turn unless something awful happens, and overwhelm them with too many fast-moving and scary targets. There's units that can deal with power armor, units that can take apart tanks... Really the only thing that could cause serious concern is a flyer, and the Soul Grinder has a three-shot S7 anti-air gun and the Bloodthirster can try for a Vector Strike (though that's not really that effective).
It might not be a tournament winning list, but I think it could have a decent shot against a lot of armies. Thoughts? Suggestions? Criticism?
I'd love to get more comments before I drop any money on this. To make this list, I just need another box of Bloodcrushers (already in the plans) and a couple Maulerfiends. (I should probably get one for my Iron Warriors, too, since it is meant for assaulting fortifications.)