So here's my first attempt at the GamesDay list. I have been painting quite a few Daemons for the last couple of months and I'm shooting for a little better paint score than my usual :)
That being said, here's the list, and please keep in mind I have SOME flexibility, but not much since GD is in about a month and I still have a few things to finish (including the display board).

HQs
Fateweaver
Epidemius

Troops
16 Plaguebearers with Chaos Icon
6 Plaguebearers
6 Plaguebearers
6 Plaguebearers
6 Plaguebearers
6 Nuglings

Elites
3 Flamers
3 Flamers
3 Flamers

Fast Attack
3 Screamers
3 Screamers

Heavy Support
Nurgle Daemon Prince with Breath of Chaos, Aura of Decay, Iron Hide


The idea is that I drop the Tzeentch Daemons against shooty armies and the Nurgle against assaulty as the first wave. The army is very lopsided (ie about 75% to 25%) thus even if I lose all the Tzeench as a result of shooting or bad drop, I can still play for the draw with the Nurgle. Against assaulty, the Nurgle squads are small enough where they will be destroyed just in time for the flamers to drop in.
Again, I can do some permutations, but not much will change (maybe replace the Nurglings and a unit of Plaguebearers with another DP).
Anyone have any input on Daemons from what you guys have seen out there?
Cal

Fateweaver is great for rerolling saves, except for every one he takes he might skedaddle off the field. Maybe go more aggro with Skarbrand or a regular bloodthirster or keeper of secrets.

Epidemius, while ticklishly fun, isn't all that spectacular. You'd need a nurgle greater daemon to start racking up those kills, as the plaguebearers don't ignore armor and don't shoot. The daemon prince could work, but would work better with wings.

While the mass of plaguebearers is great for a tarpit, they are a bit slow. Of course they are there to hold objectives I'd imagine . Even then they don't have the punch that bloodletters would have.

Flamers and screamers are fine and tasty.

What, no soul grinders with templates of doom? ;)