Such a pretty game. Hard to estimate value on this one. It's one of those games that seems to have gotten more popular/desirable as of late. Boston Pinball puts an Ebay average price of $600 on it but I'm guessing guys would be lined up to buy them at that price.
I thought of your Star Jet project this week though. I was at friends place rummaging around. He's getting ready to clean out his storage room and said he would be giving me some pinball stuff. Included will be a 1960s orphaned Bally head. But alas I believe it is from the single player Bull Fight.