Try Guild Wars, it's a PvP intensive skill-based MMO in which you reach maximum level very quickly so most intermediate and advanced players are all the same level (20). You have eight power slots where you can add, remove, and constantly change your mind about hundreds of powers you can unlock and by doing missions you can change your sub-class and completely change half of your power pool! The items are balanced enough where you can have a really good item but if you're not still on the balls of your feet your going to get stomped in PvP anyway.
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Try Guild Wars, it's a PvP intensive skill-based MMO in which you reach maximum level very quickly so most intermediate and advanced players are all the same level (20). You have eight power slots where you can add, remove, and constantly change your mind about hundreds of powers you can unlock and by doing missions you can change your sub-class and completely change half of your power pool! The items are balanced enough where you can have a really good item but if you're not still on the balls of your feet your going to get stomped in PvP anyway.