Originally Posted by
noglider
I'd say anything made of Reynolds 531 or Columbus tubing should be nice and light. A big popular choice is the Raleigh International, but don't set your heart on any particular model. In fact, I know a guy selling a 56cm International fairly cheap. I don't remember how much, but I could find out if you like. What size are you?
1980's "sport" models are excellent values. Look for a Tange 2 level frame in addition to the above Reynolds and Columbus frames. Nishike, Fuji, Cenurian are some examples of japanese makers while Trek is an American mainstay.