So this is what i'm thinking for my build so far:
1: Dreadnecro/Factotum
2: Dreadnecro/Hexblade
3 - 20: ...
21: Defiant/Factotum
22: Defiant/Factotum
23: Defiant/Factotum

For feats Im liking:
Corpse Crafter
Destruction Retribution
Undead Leadership
Necromatic Presense
Necromatic Might
Fearsome Necromancy
Fell Drain

And with bonus feats from Hexblade Ill take:
Spell Penetration
Spell Focus (necromancy)
Greater Spell Focus (necromancy)

But I still need to pick up one more feat... any suggestions?