Recommendation for a quiet USB Hard drive?

Now that I have XBMC set up on my Raspberry Pi, I noticed that when I hook up a USB hard drive to it that my hard drive is quite loud......I guess I never noticed the whirring of the HD because it was always masked by the fans on my PC.

So before I go out and get a new USB hard drive I was hoping folks here had some good recommendations for ones that are very quiet? (and hopefully don't run too hot)