What kind of MMO you feel like playing? How long did you play WoW? These are things that would help decide what your options are. only going to talk about the ones that are out already cause you seem like you want to play now not in a few months.
AOC is more action,( as long as you play a melee class) and more adult then WoW
LOTR is like WoW but in the tolken world.
If your looking for a change in setting.
I had some fun with City of Heros and City of Villians.
Tabula Rasa isn't bad, more of anction shooter. In a sci-fi setting