My fighter just attained 3rd level. He started using a magical ranseur and I'm looking for suggestions on the best choice in combat feats that would work best for a polearm type weapon.
I would recommend the combat reflexes feat and other feats to utilize attacks of opportunity combined with your reach.
Combat Reflexes, Power Attack, Pushing Assault*, Stand Still*, Lunge, Weapon Focus, Weapon Specialization, Cleave, Great Cleave
All of that stuff is good. Pushing Assault and Stand Still will break charges and keep people away from you and anyone behind you. Pushing Assault doesn't use the CMB/CMD mechanic like Stand Still does and does some damage to boot but it can be very tactical/rules lawyerly to use it to it's fullest so some people will want to avoid it and go with the inferior Stand Still for ease of use/not getting in rules discussions mid combat.