I like Factotum 1/Ardent 4/ Chameleon 10/Ardent 5.

It lets you pick up 9th level powers and you get just a touch of factotuming that you may or may not want to FoI into being useful.

You want high Int and Wis but as always Chameleon helps loads when it comes to the muh-muh-muh-muh-muh-MADness.