Level 5 shaman. You already have a pally if you want to do the tank, healer 3 dps later. I do the tank, healer, 3 dps and want 5 shaman. Plus pvp bg's with the exception of wsg is better to have 5 shaman. 5 of the same class is much easier to play. All their cast will be the same time unlike my mages long fireballs vs quick lightning bolts. Some guild members are having a much easier time with heroics with 5 shaman than I do with tank, healer 3 dps.