It depends on the fact if you play it over a LAN or over an internet server.
Cause if you play a LAN you could try to play games like Titan QUest or Dungeon Siege if you like hack & slash games. Also a pretty fun game is Jedi Acadamy but that is a star wars game don't now if you like that.
If you play over an internet server I don't really have a suggestion for a RPG game. I do know that a lot of internet game's are shooters and if you like those i could suggest to play some games of the Battlefield saga (I really like those espacially 2142) also a good game(in my oppinion) is Crysis but that is a game wich requires a very good pc.
So I hope i could be of any help and good luck playing
