Western Digital Caviar SE16 - 500GB, 300 MB/s, 16 MB Cache, 7200 RPM - SATA - Internal Hard Drive $131.22

WD Caviar SE16 500 GB drives scored a 5.9--the highest possible score--on the Windows Experience Index performance tests built into Windows Vista. These drives combine 16 MB cache with 300 MB/s transfer rate for lightning-fast performance and cool, quiet operation. Enhanced reliability features help protect the drive and the data stored on it.

Buy.com is carrying this 500GB SATA - Internal Hard Drive for $131.22