Wow... nice stats. I would swap Int for Cha, unless you plan on picking up Intimidating Rage. Dex or Con is a tough choice; Dex is better early on when AC still matters. Once you hit the higher levels, you're going to want the higher CON. Personally, I'd go with Dex.
Weapon: Greatsword is the best choice, by average.
Multiclassing? Extra Rage gives you 2 more rages a day.
My 4 level build-
1: Barbarian- WF:Greatsword, Extra Rage[CW].
2: Fighter- Power Attack
3: Fgt- Cleave, Improved Toughness[CW]
4: Bbn- [Uncanny dodge]
This leaves you pretty open in terms of where you want your character to go. All of those feats are highly useful, no matter what the situation.
From there, you could go Bear Warrior into Warshaper, whose 2nd level ability gives you +4STR and CON. This also allows you to be a threat even when unarmed and naked (a situation that happens about once in a campaign, but when you need it you NEED it).
I highly suggest you NOT go Frenzied Berserker: your party will thank you for it.
More information can be found on the Wizard's Boards:
http://boards1.wizards.com/showthread.php?s=&threadid=207643#post2947050