Sorry man, but I have to agree with most of the people on these boards... more than two levels of Barb is not a good thing. I know you hate cross classing, but sometimes it just isn't worth the otherwise bad character you'd have. Ditch three levels of Barbie and grab some ranger, warblade, fighter, anything. Anything but barbarian.
Also, in response to those of you who are unaware of how 4e does feats, picture not gaining feats at 3, 6, 9, etc. and instead gaining them at 2, 4, 6, 8, 10 and so forth. 4e also grants an extra feat at levels 11, 21, and 31, but I ditched those. I figure most classes are starved for feats, so I switched it up a bit. Also, if a player can give me a good reason, I give them one optional flaw.