Actually, so far, the Factotum is my favourite. Because... It is.
Hathran is from FR, correct?
I like the Factotum 1/Wizard 4 build alot, though I don't see the point of taking factotum at all.
I think staying away from casting is a good idea for this one, at least, 9th level casting. In the game (or, the main game) I'm playing, everyone is playing Wizards, Clerics and Druids, and I'm a little sick of them. The worst part is how we still aren't decimating encounters, because the rest of my group is idiots. (We have an Evoker, an Enchanter and my Conjurer, along with a Cleric of Kord and a Druid. Also a Ranger and a Rogue, but they show up rarely.)