Power Attack is a given.

Scribe Scroll is a good feat to have if you're given time to craft.

Knock-down is great if you can spare three feats (probably not likely, but maybe worth mentioning, no?)

Standard Melee feats (Leap Attack, Shock Trooper) are good.

Holy Warrior is good at higher levels, especially for Archer-types (if you're going that way)

Eschew Materials/Somatic Weaponry depending on how strict your DM is.

Touch of Healing is nice if your party expects you to keep them healed and you expect spells to spare afterward.