Well, i am too lazy to restart my computer and boot windows, but my "old" GeForce MX 4000 PCI card had VGA out and S-Video out (a friend bought it at best buy a few years ago, and didn't have a use for it, so he gave it to me. I also have the AGP version, which i bought.)
You will need a pretty good computer to run the nVIDIA Forceware software (for zooming.)
If you DO decide to use an old DVD player, or something similar, you could always break the hinges, and mount the screen on the base. That way it would be about the same size as a GPS.
EDIT: **broken link removed**
scroll down to "zoom"