I just purchased a 7200.10 320GB Seagate and think it's the best bang for the buck when you consider the excellent reputation of Seagate for quality and reliability. I got it for $95 shipped. I haven't had much time with it (Just got it two days ago) but, so far I haven't noticed any loud noise from it. My other drive is a Samsung Spinpoint 160GB which I bought for it's reputation for silence.
