This Hard Drive

ClubIT.com has the Seagate Barracuda ST3750640AS 750GB Serial ATA 3Gb/s 7200RPM Hard Drive w/16MB Buffer for $188 + $7 shipping = $195 with free shipping. It uses perpendicular recording to achieve a higher storage density than standard drives.

Product description from ClubIT.com:

With 750GB of pure digital storage in a single drive, the Barracuda 7200.10 is the largest, most reliable disc drive around. New perpendicular recording technology supports vertically stored data bits, enabling increased areal density and dependability for workstations and performance PCs.