I think I'm a bit late to the party, but in answer to the original question:
One option would be a late-1980's Trek Elance 400. Renyolds 531, decent Shimano drivetrain, and overall not that valuable a bike to begin with, so sometimes can be had within $75-125 if bought right.
There's no incentive for most sellers to swap components on these, as they're usually halfway decent to begin with - which will also work for you.
-Kurt
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