I'm rebuilding my barb again, and I can't decide which combat skill to use. Concentrate is nice, cause it boosts defense and attack rating a lot, but not so much damage. WW is nice, cause it hits lots fast. Berserk is nice, cause it can give you insanely high damage, while lowering defense (I can't seem to find any numbers on how much though). What do y'all think is my best choice? Anybody happen to know how much berserk lowers defense? I have a feeling it's 100%, but I don't want to waste the skill points to find out.