Good luck on the purchase, it is a good game to add to a collection. It also seems to be popular with female players.
The one you are describing sounds like a cautionary purchase though....pretty roughed up. Whats under the surface?
Like pinsiders above have mentioned, parts are not always easy to come by.
Have a good look at the ramps, especially the elevator one. Check the slot machine motor too. Used replacements are about all there is currently.