Perhaps a bit more expensive ($700-1000 in my experience) than most in this thread, but titanium Serotta Schwinn Paramounts are generally extremely undervalued compared to either "real" Waterford/P-10-era Paramounts, or titanium Serottas branded as "Serotta"
The other high-end GT-era Schwinn road bikes (the steel Paramount and steel Reynolds 853 Peloton) are also frequently great buys. People already mentioned the 80s high-end Schwinns (the Columbus Tenax bikes) as well.
Trek-era Lemonds with high-end (853/OX Platinum) steel, Trek-era Bontrager mountain bikes, high end Cannondales/ high-end vintage aluminum in general.
Last edited by sheddle; 04-02-20 at 09:27 AM.