Hard to value without pictures. I guess if you play the game and all he features work, then you have a working machine to value. If it is "as is" and needs to be shopped - $1200 - $1400. Already reconditioned - $1800. A REALLY nice example - $2000 +.
I really don't rate the game that much, but I have heard of them going for less than $1200 "as is".