Alright Bbowdoin,

I think that you're definitely on the right track. A used chromoly steel road bike or hybrid, from the 80's era would be perfect. Therefore, you'd have to keep a patient eye out for just such a steed on your local Craigslist. As long as your used bike doesn't have any rust issues, you should be just fine. Of course, you'll have to test ride the bike prior to making the purchase, because it's absolutely imperative that your bike feel very comfortable when riding. Also, it would be a good idea to take someone along with you who is familiar with bikes, just in case.

Try to find time to join a nearby bicycle co-op, so that you'll be able to handle basic bicycle repairs on your own.

Good Luck!