I'd definately like to have a thief. Not only for the convenient trap removal, but also for the ability to dispel illusions in spite of SI

ivination.
As Aragorn1 suggest a kensai->thief is a good option, one I have used myself in my most recent game. The backstab hits like a ton of bricks and when the enemies tries cheese or simply has their contingencies fire it is so easy to get rid of misleads, imp invisibilty, simuls and that lot.
Since your thief HLA UAI will negate the kensai armor restriction while preserving the bonus you have excellent AC.
My two cents worth. I'd have
Sorceror (for the obvious and for convinient recharge)
Mage/Cleric (for the rest)
Kensai->Thief (tank and assasin par excellence)