ones thats got medium popularity. high popularity will overwhelm you and make you sad, trust me im in one thats high population 24/7. ironforge is so painfully slow to load it makes me want to cry. however dont go into a low populated server, its all thin with players and boring. also, join a PvP server. it just gives you the ability to fight other players; something you will eventually WANT to do from time to time. you cant do that in PvE or *shudders* RP servers..