This is a tough one. I think it really depends on your style of play. Is rerolling a level 14 character a big deal to you? If not, then go the 14/2 Barb/Rogue route. If it took you 6 months to get to level 14 and you really like this character then add the 2 levels of rogue now and pick up Crit RageII at Mod 9.
I've got a 16 Barbarian that I really wish had evasion. As it is, my tempest is my new main Tank.
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