Lacie Drives

I bought a reconditioned Lacie drive from their website (250Gb for $80)
http://www.lacie.com/products/clearance/products/?id=10007
which has been great. I recommend you get one with firewire and usb if you ever want to "clone" or "ghost" your hard drive.
http://www.macmall.com
( a reliable vendor) also is having a sale on Lacie right now.