Grab an enclosure. The Metal Gear boxes are pretty good, and go for ~$59 with both USB and FireWire. They're small, metal, look good, and cool the hard drive like heat sinks instead of adding a fan. (Quiet)
Grab your best deal on a 3.5" drive & put it in.
<a href="http://www.newegg.com/app/viewProductDesc.asp?description=17-155-215&depa=8">$45 at newegg.</a>