Hmm, I was also going to say Factotum or Psion. But now I will try to come up with some other ideas ...

A 3-level Swashbuckler dip is tempting.

Incarnate or Totemist could be very interesting. Incarnate if you want to make your character more flexible, especially out of combat. Totemist if you're trying to make him even more of a melee monster.