Here is an auction with fully rebuilt cannons,should be a good gauge of the current pricing if it goes the distance and is not sold beforehand looks in pretty good nick too. http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=150823184097
Mmm yeah interesting to see what it goes for. 5500$ buy out seems a bit rich.
I'm going to have to start learning these pinball terms.. What does GI stand for? And what are optos?