Computergeeks.com has a WESTERN DIGITAL 40GB 8mb buffer for only $50.50, 3 year manufacturers warranty. I'm thinking of getting one myself since I built another pc. I'm not fond of WESTERN DIGITAL but I do have a old 6gb hard drive that still is running after 8 years.

http://www.geeks.com/details.asp?invtid=WD400JB-N&cat=HDD