What model Treks do you own? in 80's steel, the top level built with Columbus or 753, I think model numbered 170, 970 & probably some other #s, would probably be the most collectible and worth the most unchanged. My '84 760 (531c+Superbe) is unrestored and original except for the wheelset (NR+Mavic), but I'm not sure that has affected its value. I just haven't seen any sell for what it would take for me to part with it. Ride them, keep them in good shape, keep your original parts, maybe someday the market will come around.