Hey, I'm considering replacing the 640 gb Hitachi HDT721064SLA360 in my 24" iMac with a Samsung Spinpoint F3EG HD203WI 2TB drive. I'm just wondering if anyone can tell me whether I will see any performance increases along with the extra capacity. The Hitachi is a 7200rpm drive, while the Sammy is 5400rpm, but the Hitachi has only a 16mb buffer and the Sammy sports a 32mb. Would the Samsung be faster than the Hitachi or would it suffer because of the lower rotational speed? Thanks in advance!