Shaman for life! Its not boring class ( even ele ) like some wrote here. Sure PvE rotation on ele shaman is kinda easy , but you have always a choice.. go melee , go ranged .. go heal. Even if you get bored with some spec , you dont need reroll whole new character , you simple go farm diffrent gear.

On other hand i love disc priest in PvP and also like holly in PvE. Diffrence in dps like Momokk shown is not that big , so both choices are really good.