Thanks for the additional info
I'd say probably a DK or a Feral is what you would enjoy most given the above. Rets and Enhancement can have trouble finding RBG spots - there is a big emphasis on class stacking in RBGs, and anything that isn't capable of topping damage, or burst, or healing is often ignored - despite that the hybrid specs give a lot more benefit than damage alone (it's much harder to measure whether a ret or enh is doing their job well in an RBG team than to measure whether a DK (top damage) or a warrior or lock is (top killing blows). So if you plan to get to 2.2k - it will be easier to find a group at least if you are a DK or Feral.
All of the specs you are interested in are well capable of 2.2k in both arenas and RBGs, so there is no real limiting factor there. With that said, I'm coming back to the DK/Feral thing again - while Unholy is just overall weaker than Frost - Unholy isn't bad either. Enhancement is somewhat limited in what comps they can play - fortunately for them - some of their best comps are with warriors and hunters who are both very strong right now.
Rets and DKs have the largest comp diversity in Arenas of the lot. Ferals and DKs are probably the easiest ride to 2k2 though - some of their comps don't take a ton of coordination, but do so much damage so early in the match that they kill less-prepared teams - those same comps struggle above 2k2 - but if that's your goal, thats not a worry
So ya, probably give feral or DK a try - you can play any of them if you find one you have a preference for - but we can probably narrow the most logical choices down to one of those two