Josh, you lost me there. This falls into the option 4. bracket.

I found out who the company is that makes the drive enclosures for Firewire and USB2 (pity they don't do one which has both connections
Firewire http://www.adstech.com/products/PYRO1394DriveKit/specifications/PYRODriveKitProdSpec.asp?pid=API-800
USB2 http://www.adstech.com/products/USB_2_Drivekit/intro/USB2DriveKit.asp?pid=USBSX-804