Go the good ol' Loremaster. Over 10 levels you get the equivalent of 5 feats and the bard's Knowledge (everything) bardic lore ability, and a few handy abilities like free identify and bonus languages. But my mind was really made up when I found out it had 4 + Int bonus skill points per level. Who can't do with a few more skill points?
Alienist is also fun, the downside being its strengths are focussed on summoning, which wizards aren't optimised for (unlike druids).
Cheers, Al'Kelhar