If you go to NADA and look under Matrix Marine the will have a guide for used price for the years 1985-1986 after that it would be Aquarius. Remember this is just a guide. I owned a SC20 and loved the boat. Dan is right about the fire hose comment. They say you can't pitchpole one but that is untrue, I have done it. The mast hit the water so hard and the noise made me think that I had snapped the mast, but the only thing was I broke every batten (the tubular taper ones) and a few rips in the batten pockets. A great boat but bring friends as it is a beast to move around on the beach.