I have an Adaptec SCSI card in my current desktop.

The new computer will be another "desktop" (with the capacity for additional cards) if necessary.

I was just hoping to reduce the amount of space and cabling required by transitioning into one of the "All-In-One" units - something like this: http://store.sony.ca/webapp/wcs/stor...52921666458922 (for purposes of illustration).

Our family computer is in the living room

SCSI to Firewire adapters did definitely exist at one time - you can find 10 year old or so postings about them on the internet.