Try eve online, if you want to try something different from wow, its about far away from being wow while still being an MMO. Eve is hard to get used to and get into though, but if you do find a group of fun people to play with, and if you can get your head around that fact that the point of the game is not to grind quests and gain levels you will find it immensely enjoyable. Essentially eve has no end game content like other mmos, there is just content, so once you learn the game, and this will take a while unfortunately, go out and find a corp (aka guild), and have fun with the game, a lot of people tend to get bored because they shovel themselves into the mmo trap where they think they have to grind for hours, and make their character good before they can join the rest of the game.