I'm thinking of getting a new MBP, but want to be able to play MMORPGs like Warhammer Online or similar games coming out. Can anyone speak to first hand experience with the various 15" MBPs with i5 or i7? With 256MB GT 330M vs 512 MB? I would love to be able to get the 13", but I'm sure that video card won't make it happen. Thanks in advance!