I don't want to use a laptop screen, definitely. If I could find a 750mhz or so laptop for cheap I'd use that but I can't see that happening.
rovingmind, that's a good idea, and there already a couple people who do that in my area. What I can do, though, is head to the town recycling depot and keep an eye out for useful machines. The old guy that runs it knows me and lets me take what I want. I just wish it were a little easier to visually separate the reasonable MAME boxes from the ones that aren't any good since he doesn't let me open them, I have to take them whole just by looking at the case.