I would say an original in very nice shape with a new playfield installed and very good condition everything else is worth slightly more than a new MMR. Like a few hundred bucks to someone who would plain rather have a nice original. So figure if your machine was fully shopped with a new playfield and everything shopped, clean, and unbroken it would probably fetch about $8500. So start deducting from there. Visible wear on the playfield take off $1000. Excessive damage on the cabinet, take off $500. Any other broken parts or worn out parts (display, ramps, plastics) deduct their cost. That's my take on it anyways.