Hi All, expecting my MacBook Pro 2.2 15 this week but wondering whether I made a mistake with the drive. I ordered the 750GB 5400RPM drive and am wondering whether or not I should have gone for the 500GB 7200RPM drive? I eventually want to go SSD but for now I'm worried that I've paid for all this performance only to put a slow drive in it.. Anybody know what real world difference the quicker RPM drive will provide? Thanks, Rob.