Grogg of the North
Adventurer
What about something like Fist of the Forest from Complete Champion? It would fit in with a more native dwelling barbarian that's attuned to nature spirits. And you get to beat the BBEG to a pulp with your fists. Bear Warrior could also work for a nature themed barbarian. Primeval (FB) could work too but I think its a little too far away from what you're looking for.
To improve or enhance your rage abilities, there are a few options. Extend Rage, Extra Rage, Intimidating Rage, all from CW, spring to mind. You could also take Improved Resilience (CW) to up your DR but spending a feat for only +1 to your DR seems a bit much.
If you go for Fist of the Forest, you'll want Improved Natural Attack because your fists are just that awesome. Elusive Target and Defensive Throw work well for a FotF but require extensive feat investment and you may not wind up getting them until very high in level.
Otherwise, Power Attack & Leap Attack are fun feats. And I also recommend the mage slayer tree.
To improve or enhance your rage abilities, there are a few options. Extend Rage, Extra Rage, Intimidating Rage, all from CW, spring to mind. You could also take Improved Resilience (CW) to up your DR but spending a feat for only +1 to your DR seems a bit much.
If you go for Fist of the Forest, you'll want Improved Natural Attack because your fists are just that awesome. Elusive Target and Defensive Throw work well for a FotF but require extensive feat investment and you may not wind up getting them until very high in level.
Otherwise, Power Attack & Leap Attack are fun feats. And I also recommend the mage slayer tree.