I'd say a ballpark estimate ranging from decent player condition to restored status might be as follows based on current trends, especially here in the PNW.
QS 1800-3500
SG - 3000-6000
SW - 2500-5500
Quoted from Mitch:Dont see these come up too often. What's the going price for these titles.
Quicksilver, stargazer, seawitch