The Panasonic/Schwinn Paramounts are very nice and underappreciated frames. Some of the later Mississippi (I think that's where they built their second US factory, not completely sure off the top of my head) Schwinns are nice lugged and double-butted frames and also tend to sell for nothing. Tempo is the only one I'm familiar with, as a guy recently gave me one for fixing his other bike. Nice Columbus DB frameset. I know there are some others.