this guys link to a barb build for 40+ Grs is right on... my DB Barb runs 40-45 GRs all day. OFC know IK Belt, weap are required and then 1 other piece of IK doesn't matter which one.Can't comment on Monks, but I know they're fast and strong.
I am running a WW barb, and they're extremely fast at clearing T6 (Usually clearing within 60-80 seconds, and am currently botting 45-49 GRifts, and clearing before the timer ends.
Can anyone comment on gear and Skills for Barb? My Barb can only do upto 35 where my Monk can do 47 :/