try all pallys, everyone can take a beating, everyone can do dps, everyone can rez the fallen, everyone can heal.... and ret pallys are very simple to play ( concecrates,judgements and melee swings ).
finished uldaman at 38
I'm 5 boxing but i've done every instance except the one in inside of the horde city ( i'm alliance ) well within the range normally acceptable for the instance, I'm heading to Zul'Farrak now at level 42-43, just need to get a few more quests.