Nice topic. It surprises me that some of the titles mentioned here come up for sale fairly often here in the Netherlands. Capcom Breakshot, Airborne and Pinball Magic to mention a few. And the museum around the corner here features an Orbitor 1, a Punchy and The Matrix!
I am currently working on a Bride of Pinbot 2.0, I guess that would qualify as well, as not more than a few dozen of those kits were shipped so far .