[The Wraithlord]

Dunno about the rest but concerning this:

8 Havoc's with 4 Missile Launchers[MoCU, Infiltrate] 224

I would go with 7 Havocs, no mark, Infiltrate, Tank Hunters and Autocannons. 220pts of excellence. 8 shots at S7 vs infantry or S8 vs vehicles. I would rather fire 8 missles at a vehicle than 4 and against hordes, this unit will work even better. AND save you 4 points

 

[The Wraithlord]

Models with a mark different than the leader's become Elites. That means that anything with the mark of Chaos Undivided in an army lead by a model with the Mark of Khorne becomes an Elites choice.

Incorrect. Pg38, chaos codex says that only applies to models with a mark OTHER than chaos undivided. The other exception is if they have the same mark as the general of the army.

 

[The Wraithlord]

Because its not the same as two big badass daemons chewing though the opponents army

Not to mention the fact that a Bloodthirster inspires sheer terror in most opponents. Hell, there are few seasoned players that can just shrug at a thirster. I have one leading my wip LatD list and I won't trade it for anything