Witch hunter for moar damage?
Beast Totem also gives claws which is great if you are going natural weapon based or even if you aren't in the long run; two attacks at full BAB before level 6 can be quite handy and you are always armed should it be necessary. Extra AC from the second power is also nice.
Dragon Totem is nice if you don't want Beast as it gives a total of 6 DR, a limited fly speed, and good energy resistance to one element of your choice on top of a few more minor benefits. The downside there is that it has two other bleh Rage Power prerequisites so it is a 5 power long chain.
The Elemental Bloodline tree is mostly meh, but can end with a fly speed of 60 for you.
Reckless Abandon for a scaling attack roll bonus; just enough to off set the penalties from Power Attack, but not good if you care about AC.
Boar's Charge/Disemboweling Tusks are pretty sweet if you have a Gore attack or are planning on getting one via Rage Powers.
I've enjoyed Raging Grappler a lot. As of Unchained, Intimidating Glare also gives you Str to Intimidate instead of Charisma, possibly saving you a feat. IG also opens up Terrifying Howl, which is a pretty decent fear effect with a potentially tough save.
I seriously considered Clear Mind for my Skald cohort since failed Will saves can be a big problem. Other party members requested Guarded Stance instead though since it pairs very nicely with Beast Totem. Obviously a lot of folks would prefer Come and Get Me (or whatever the Unchained version of it is called), but if you're a little more defensively minded and don't want to pay a feat to support all those AoOs then the AC buffs can be nice.
I seem to recall that your DM doesn't allow magic item purchases. Otherwise a Gore attack can be gained from Helm of the Mammoth Lords and Lesser Beast Totem could let you avoid the 2 level Ranger dip. A Monk, Brawler, or Fighter dip could help your grappling or open up some Style feats.
Reckless Abandon for a scaling attack roll bonus; just enough to off set the penalties from Power Attack, but not good if you care about AC.
The Guarded Stance and Rolling Dodge powers can help offset the AC penalty there. There's another Rage Power that can get you your Rolling Dodge bonus on your Reflex saves, too!
If you're using Unchained then Reckless Abandon becomes Reckless Stance and is a Rage Stance just like Guarded Stance and Taunting Stance (which is the replacement for Come and Get Me)
Unchained isn't totally a nerf for Barbarians though. My Feral Gnasher has certainly enjoyed the temporary hit points and the boost to his Intimidate modifier (which being a low Charisma goblin with a -4 against most foes was previously kind of weak)