Oh, I thought it was $6K to add to my collection. For me it would be a Funhouse (I have practically everything else I need and have room for!)
For you, hard to tell. I'd go the three game classic route and get less expensive, less popular games to start your stable. Get the popular stuff later. I say get three Williams/Bally WPC games. They'll hold their value and are easy to work on.
BoP
DM (need a widebody!)
???