Good feat for dual weild???

This. For both PvE and PvP. Please.

Personally, I'd use this for PvE(don't play PvP):

http://goo.gl/IKisMw

2H would look like this:

http://goo.gl/Oz9XBz (it was more difficult to manage, but it would be easier to play ofc)

Have fun!

pve and pvp builds would be very different...
i don't have experience in pvp with barb, but for pve i'd suggest those:

group, single target: http://goo.gl/z1iND7
group, aoe: http://goo.gl/zHiibh (careful with aggro!)
solo: http://goo.gl/FOIVmd

good luck!