Hi. A friend of a friend has a Mondonico Diamond lugged steel bike, Columbus SPX tubes with a full Campy Chorus kit, 58cm I believe. No rust, well maintained, original fork. What's a good price this bike? SPX tubing was used in the late 80's I think. Not sure what speed the bike is. What other information should I try to obtain to help you guys help me out? Ballpark $500? $1000?