I've wanted to get a different form of exercise so I dusted of my 1975 Sears Free Spirit 27" bicycle. Talk about old….the side walls on the tires are falling off, but it works. I decided to get a new bike because it was always too big for me. It is very over whelming, so many brands and how the industry made wonderful improvements. I figured I need to spend $400-$700 for a good bicycle like a Scwhinn 2007 World Street and will read this forum for info to help me make a decision. I also like the folding bikes as well. I was thinking of donating my old bikes to a cause like Pedals for Progress. Is this a good Idea? Is this Free Spirit men's 10 speed worth anything? How about a Ross Eurosport?