Just be aware of the pvp imbalance. Don't get a level 110 in one of the worst classes or you'll be sick of getting stomped on within a month. I don't pvp a lot but I know rogue, boomkin, and hunters are legit right now. Anything melee is not terrible. A good handful of casters are just left in the dust with so many melee classes having multiple stuns/interrupts. Melee are also the ones who primarily have the immune to stun/interrupt/CC, while casters usually get just the one get-out-of-CC on a long cooldown.
In short, any two melees can pile onto just about any caster and have him spell locked or stunned 100% until the caster is dead. Since pvp is almost never 1vs1, this is a sad story for casters. Boomkin is the exception as far as I know.