someone donated me a bunch of tier 14 rubies, so in a helm, you get like 31% bonus xp. I also got king leoric's signet (+22%), so that's +53% exp on mp1-5 difficulties
A good place to level up by killing dudes (as opposed to doing quests) is Act 3, the 3 floors of dungeons before the Larder. Also, Whimsyshire on master 1 was giving a crapton of exp, but you need to unlock that yourself or find someone with.
Xbox live - Meddlingmage25 UMVC3 - Dormmamu, Dante, Magneto. Playing: Diablo 3 xbox, MH3U - 3DS
in the olden days of D3 on PC you needed two people to do this. you have to get to act 2 and kill that guy who's head, blood, and body you find. once you kill him the game will save. but dont talk to leah or go back to town. have player B leave the game and start a new game. player A will go and complete the quest by talking to leah or adria (i forget who). once they finish the quest.save and join Player B's game. Have player B exit the game. In theory, when you get migrated into another game, you should pick up right before you need to talk to leah or adria in order to finish the quest. Im not sure if this will work on xbox or PS but this is how we used to do it on pc.you could get to 60 in about and hour or so. or you could have someone rush you to inferno and put the difficulty to master 5 and do this faster.
GT: PrinceEm0 either 0 or o i forget. PSN: Dayman427