it's a different game, with good parties all players lvl the same, but ye ... that's not happening right now
I think for solo play warlock or a str build would be good, otherwise if you have mates online etc then the bards/clerics have alot of fun
basically all depends on your game play and what you like to do.
pure str:
tanks, needs party to lvl, (rogue with crossbow possibly an exception), rogue skills look cool
pure int:
warlock can solo, rest need parties, massive damage from wiz, lots of fun from buffers in a group