I have a Schwinn Le Tour which I bought used in 1984, so it's about 20-25 years old (antique?). It's been used very little, especially in the last 10 years. It's a 10 speed and I've concluded I need at least an 18 speed for the hills around where I live, so I've decided to sell this bike. I really hate to part with it, since I've had it for so long, but I just don't use it anymore. It's light blue and has some scratches, but otherwise in good shape. What would be a fair price for this bike? Thanks.