I was browsing best buy and found this: http://www.bestbuy.com/site/olspage.jsp?skuId=9539564&type=product&id=1218121171449 The drive inside would seem to be a 2.5". I am thinking of buying this. But first, I wonder how this will measure up... (1) performance-wise. How will the drive nside of this perform in comparison to the stock 320GB 5400RPM in my 15" MBP? (2) physically. Will this drive fit inside my mid-09 15" unibody? I know that people say the 640s and 720s do fit. (3) energy-wise. Will this use significantly more power than the 320 I have in there? (4) heat, sound, and vibration wise. Will this produce signifcantly more of any of these three things? Any advice? Should I do this? What outcome should I expect?