Game is alot of fun and hard to get an equally fun reliable game for the same amount of money if you sold it for $1,200 Mine isn't collector condition but is nice with LED's, new MPU, new power supply, pinscore display, new interconnect board, and some other upgrades as well...$1200 wouldn't take it...not that it is for sale.
I'd say if you saw one for under $1400 in good playing condition you should pick one up, very fun. I have never seen a sale price for a diamond plate one but those are very nice as well. I could see one of those going for $1,800 - $2,000 because you almost never see them on the market.
Only thing keeping the price down on this one is there were 5,000 of them made and I doubt they were played all that much on route back in the day as DMD''s were right around the corner. Not a rare game by any means.