Seagate Barracuda 7200RPM 500GB SATA 3gb/ps Hard Drive -ST3500630AS $199.95

This 500GB Barracuda 7200.10SATA 3Gbps internal hard drive provides a speedy 11ms average access time at a 7200rpm spindle speed. Its 3Gbps transfer rate via its SATA interface will knock your socks off. Its Native Command Queuing provides higher system performance in demanding applications, reduced drive wear and tear, and easier system integration. Plus, this super-quiet drive is almost inaudible. The difference between idle and seek can hardly be detected by human ear, making drive operation almost silent.

Buy.com is carrying this 500GB SATA Internal Hard Drive for $199.95