What's the highest capacity 7200RPM the new MacBook Pro's can accept? I see that you can put in a 500GB HD, but can it go any higher? I'd love to have a large capacity drive for multiple OS's, and a Time Machine partition. Also, can you purchase RAM and take it to an Apple Store for the people at the Genius Bar to install? I was thinking about upgrading the RAM myself, but I'm afraid I would damage the MBP some how.