Looking for a used pair of 700c clincher racing wheels on a limited budget -- maybe deep dish carbon (40 mm or more) or trispoke aero wheels for triathlon, or possibly a rear disc. Something like HED H3, Hed Jet, Zipp (probably not on a budget), Renn, American Classic, etc.
If you have only got a front aero wheel, that might be OK too.
If you have only got a front aero wheel, that might be OK too.