These are the differences I see. I am asking because it doesn't seem like much of a difference, and I'm thinking I missed a huge one. MPB, lowest end 13 inch -little lighter and thinner -firewire 800 (400 for mb) -SD card slot -longer battery (thats the biggest one for me) -nicer display, backlit keyboard I thought the graphics card was different, but it looked the same on the specs. For $200 more, what am I getting? It seems like I'm missing something.