How this working for you? I haven't really bothered to regem (don't see a point for a month, and gems are still like 150g or so on my realm, and while I'm a JC I'm too lazy to farm ore) so I'm at like 40.5% haste, 29.xx% crit and I forget mastery but I want to say 30-something%. My DPS is bad though (on the non-stupid fights where Ret is just trash, like 11.5k) although everyone other than me is in mostly mythic gear while I have like maybe 2 pieces.
What mlcfay said is the way to go. Mastery is just worse than crit and haste atm.