Lords : 345/375
Daemon Prince : Armour, Flight, Tzeentch, Wizard Level 1
Total: 345
Personally i would drop the wings, you move 16" on the march without them, don't see them as needed. That frees up points to get that armour save to a 1+ with a charmed shield and as evertras says, another wizard level. I would also go with Nurgle on him but if you are after metal over tzeentch, go for it.
Heroes: 195/375
Exalted Hero : Nurlge, Enchant Shield, Ogre Blade, Luckstone, BSB
Total: 195
I agree that he really doesn't need the ogre blade, take the sword of might instead (str6 is plenty) and swap tha luckstone for the dawnstone, reroll armour all the time now :-)
Core : 468/ 375+
Warriors x12 : Full Command, Tzeentch, Shields
Total: 234
Warriors x12 : Command, Nurgle, Shields
Total: 234
Personally i think this should be 1 unit with
MoN and halbreds. or possibly a unit of 14
MoN warriors for the
BSB to join and 2 units of 5-6
MoK with Halberds for a couple of nice blender units.
Special : 489/750
Chaos Knights x5 : Command, MoN, Ensorcelled Weapons
Total: 285
Drop the champ, not worth the points
IMO, otherwise fine.
Dragon Ogres x3 : Great Weapons x3
Total: 204
I love these guys, usually i would say always go AHW but the
GW's help you counter T6 monsters so i say keep them as is.
Hope this helps