For purposes of leveling up the class, I'd go for Berserker tree since good gear for Barbarians while leveling is rare, and the light armor set from armorsmiths are meant for pom and tos.
Stay away from Devastatoin, Eyes of Madness, Sever and Predatory Instincts, rest of feats are ok. Try to not spend a lot of points in feats that increase combo damage by a certain %, you won't get much return for those points, it is better to get utility in form of survivability or crowd controls.