I've got a great old TiBook that's hung in there for the last 2 years with no built-in display. I dropped it and broke a hinge, and when it severed the display cable, it also shorted out the LCD driver, so it works great, just not with a built-in display.
Its got 256 megs of ram, the original stick that shipped with it, and I think the upper slot is messed up, whatever I add it reports as bad in the hardware test, but I haven't tried known-good ram, its possible the couple sticks I tried were toast. As far as storage, its got a 10 gig drive in it right now, the original crapped out on me a couple months ago and I scrounged this one from a friend.
you can see it in action here: http://homepage.mac.com/ianmeyer/PhotoAlbum5.html
make me an offer.