This guy here http://jamiesgarage.com/ has started one from scratch. Looks like a bloody eyesore, think he's only doing it to strike up keywords with google and make money from ads. I believe it usually takes a team of around 20 to 30 people to develop your average machine, not to mention a couple of million dollars at bay. Too ambitious for me.
One of the most sought after pinball machines is "Medieval Madness" http://www.pinball.com/Williams/games/medieval/
If you ever come across one on the cheap that needs a bit of tlc (or even a full rebuild) then I suggest grabbing it. You usually don't get much change from 10 grand from one in the mint. Rumor has it that, it's almost impossible to get a man to part with one.
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