Any weapon is fine for the most part. Either take greatsword for damage, or something with reach.
Save yourself a feat and gain iron will via Magical Location: Otyugh Hole (Complete Scoundrel).
Dragon Disciple is decent, as it gives you more high level spell slots. Maybe also consider Swiftblade?
Hexblade is nice for giving Cha to saves, mettle, and a familiar/dark companion. It also has better synergy, as Duskblade wants Int and you'll mostly be buffing instead of channeling spells.
Yargh, on the second write-up I did for him, Otyugh Hole was put at under misc, at level three or four.
I've put more than a little thought into Swiftblade, to be honest, but I'm growing more accustomed to the RP idea of DD.
As for the Hexblade... Well, I suppose doing a write up for both courses and weighing out the possibilities of each is a good idea, and I'll endevour it. I'm not overly worried about the Stat distribution. Were I doing a write-up for the CO Boards, as per a new build--I may be, but as its an NPC that serves a major role, I can pretty much set the point-buy where I want it.