You will want an IDE (also called PATA) hard drive of 8GB or greater in size. If you have a softmod or want to boot the stock kernel for any reason, you will need a lockable hard drive. Pick one up OEM instead of retail if possible; you don't need all the extra crap that comes with a boxed HDD and you'll end up paying more for junk you don't need.
If you would like a suggestion, I recommend Western Digital's Caviar SE16 series
. They are fast, quiet, dependable and lockable, plus they have a 16MB cache instead of the usual 8MB.This post has been edited by Vayate: May 22 2007, 08:16 PM