Online RPGs

I've been really wanting to play some sort of online RPG.

Right now I'm deciding between WoW, Diablo 2, and Warhammer Online...
(the only one I haven't played here is Warhammer)

Are there any others that I should really look into, or what would you say is best...

I haven't played WoW or Warhammer. Diablo 2 was and still is some what good, but a little on the old side.
Other than those I got big into Guildwars which was a pretty good game, but lost interest once my friends stopped playing since most of it was doing missions in groups.

I forgot about Guild Wars...I played the living hell out of that game when it first came out...I think I had like 1500+ hours over the first summer, that was an awesome game for PvP but I doubt I could get any of my friends to join me playing that which is also something I have to consider...

I used to be a huge Guild Wars nut, but I haven't touched the game in a good 6 months now. After you finish all the missions, the game get really boring really fast. The low level cap and lack of good random drops really cuts down on the replay value.

Guild Wars was incredible. For a while but I just couldnt get into it THAT much. But thats the way it was for most of my online RPG's, Ive just never loved them. I played the 10 day Wow thing and it was fun, but not 15 dollars fun and over all I havnt been a HUGE fan of the genre. Although I played the living hell out of PSO on the the Dreamcast. It was off line but It was fun as hell going through, looking for that rare plasma sword.