You can see from my signature I've found a few. In addition I've built up a few 710s for family.
The late 80s 310s / 312s (700c wheelset and not 27") are quite the value, just slightly longer than 710s / 912s and more stable riding than the pro series. You get a better fork and components in the 6xx series and above. You used to be able to find 312s for $200 or so.
I have a '90 japanese Schwinn Voyaguer, very comparable to a Miyata tourers. The lightweight imported japanese Schwinns of '85-90s may be under-valued compared to Miyatas, but they are getting "discovered" too.
Bianchi Celeste Brava
Trek 7000zx, 8000sl
Miyata: 1200, 312, Alumicross, (Uv.) Gran Turismo
Specialized Roubaix Comp (happily gifted away)
Last edited by FrenchFit; 05-07-12 at 08:38 AM.