I disagree with the Weapon Focus. The only time I would take it is for a (slight) synergy with Power Attack, and even then there are much better feats.
Unbalancing strike, Falling Star, those are OK but the one I love is Freezing the Life Blood. Get Expert Tactician and work with your Rogue, he will love you for paralyzing guys left and right. Especially when one of you gets Death Blow.
Another option is the grappling feats. They can really fcxs up casters and the like, and work on many fighter types too. Fighters usually don't expect you to grab them and can become flustered. With Spring Attack later you can leap right past the Mages protective line, grab him, and shake him like a wet rat so he can't cast.