I'm downloading Star Wars Galaxies atm, gonna see what the 14 day trial is like, got a friend that plays it aswell, and I quote he says "SWG FTMFW" which means for the mother f**king win haha
Warhammer online is coming out and it already has more then 600k people signed up for it, its the most anticipated game of this year, you should definately try it. It comes out Q2 of 2008.
Why not try WoW? Apart from the end-game being royally screwed up, levelling to 70 can be quite fun if you do it through quests and groups. If not, I thought Pirates of the Burning Sea looks quite good.