Western Digital VelociRaptor WD4500HLHX 450GB 10,000 RPM Internal Hard Drive for $129.99 shipped. Here is a screenshot for your reference. It features 10,000 RPM and very fast seek time of 4.6ms vs about 9ms for most SATA hard drives, 32MB cache, and uses SATA 6.0Gb/s interface. Note that it comes in OEM packaging, which means no pretty retail box but is otherwise identical. Most places have this speedy drive for about $159 or much more.