I recently bought a built up a 1980 or 1981 Miyata 710. I purchased the frame in good condition, with shifters, headset, and BB for $200. I've put double pivot calipers and an Easton handlebar, cane creek scr-5 brake levers, downtube shifters, 105 FD, acera RD, sugino 46-36-26 touring crankset.
Completely worth it, I love this bike and even though I'm 200 lbs, it's going to last a long time. I like the feel of the steel tubes on the road and how much shock they take up. I run 23c armadillo tires
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www.lebo.org