I give you.... Dinky the Barbarian!

http://www.thetangledweb.net/profiler/view.php?id=12694

Whopping AC of 33, with extremely painful criticals, and of course power attack. I recommend using the raging whirlwind variant that's in the SRD variant section, on the upper right. That would increase the AC to 35 while raging, while giving him another attack for more criticalness, and of course more damage.