Even cheaper would be a SATA to eSATA bracket which just passes a cable from a bracket in the rear to an internal SATA cable and makes the connector on the end compatible with an eSATA connector.
Might do that with a P5B-E that only has 1 eSATA port because now I've got 2x 1TB Western Digital MyBooks ($240 at Costco!!) and while firewire daisy chains would be a cheaper option.... once you've gone eSATA you don't go back
