Reactivating and Server Transfer

Well, under much pressure from friends, I might reactivate my Warcraft account.  With Pandaria coming out real soon and active friends on other servers, I might have to activate and move at least one character to that server. He has an abundance of gold and is willing to help me get someone to 85 at last. Now I just need to decide what class to move. It will be a healer for sure, but which one =/