what is the drive train? I suspect you might be able to score an nice crankset on the ISO/trade forums a shimano BB to fit said crank is about $30ish and likewise F+R derailleurs can likely be had cheaply.
http://cgi.ebay.com/VINTAGE-SHIMANO-...ts_Accessories
http://cgi.ebay.com/SHIMANO-EXAGE-FD...ts_Accessories
http://cgi.ebay.com/Sugino-G-3-Road-...ts_Accessories
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk