The elites slot will be crowded, there’s some fierce competition between 3 of the units in it. How you build your elites dictates what all your other FO slots are.
Fiends of Slaanesh: Great!
Fiends are 30 pts each, and for that you get Beasts, hit and run, and... 5 S5 RENDING ATTACKS? WHY DOESN’T EVERYONE HAVE 18? Well, for downsides- they’re as durable as 2 bloodletters, so, they die quickly. They are good for ripping tanks to pieces, but I’ve found Chariots of Tzeentch do the job better. Also, try using them like heralds of Slaanesh, bouncing in and out of combats. Unlike Heralds, they can stay in combats too, and murder lots of face.
They are a great unit: I, personally, don’t use them. If they were in Fast Attack, I would use them more. Oh, and give one Unholy Might, it’s a pretty good buy.
Flamers of Tzeentch: Great!
Flamers come with Breath of Death and Warpfire standard, and with BS4, they know how to use them. Jump Infantry status is very useful to get where you want, lining you up for burnination. Speaking of, 4-5 can kill almost anything by burning it: anything w/o an invulnerable is simply annihilated, and with a little luck, even terminators can be brought down by them. Bolt of Tzeentch is a good choice: it lets the unit threaten anything, and yes, I KNOW it’s expensive, but the utility is well worth it.
This unit takes some skill to use: after they burn something, there’s a good chance they’ll get assaulted unless you have something nearby to charge for them. Stay back and pepper things with warpfire and Bolt until a nice, expensive, vulnerable target presents itself: Flamers are assassins, use them that way and they will serve you well.
These are bloodletters, but without the durability issue: they just... rampage. Get a 3-6 squad, drop them close, take 3 wounds from shooting, and RAMPAAAGE!
They’re T and S5, 3A, WS5, power weapons... that’s amazing. Getting the charge with these guys, even just a 3-man squad, murders lots of things. 12 S6 power weapon attacks is just enough to kill a bunch of models, and usually stay in combat until the end of the your opponent’s assault phase, by which time everything will be dead. Try more, try less: see how they work for you. I prefer these guys over fiends, as they are much killier. Fury of Khorne isn’t a bad buy, to avoid getting stuck in combat with dreadnoughts. They aren’t bad icon holders, either. Don’t get instrument, they are winning combats. One last note: Do NOT be afraid to run ahead and get charged: it’s better than hanging back and getting shot to death and doing nothing.
Beasts of Nurgle: Bad.
The red-headed stepchild of the Elites. They’re as tough as 2 plaguebearers, with 5 pts for random attacks. And they don’t score. And they aren’t even beasts. :\ With such fierce competition for the Elites, I would leave these guys at home.
That’s all for Elites. Next is Fast Attack!