Which Air Compressor should I buy?

Thanks for the input I appreciate it, but that price seems high for a used one, almost as much as a new one.....

You're missing the point, you have to compare the specs.

Craftsman 30 gal. Air Compressor, 6 hp, Vertical Tank, Oil Free Pump Model# 919.167313 - Displacement 11.9 CFM - 120V/15A 8.6 SCFM @ 40PSI - 6.4 SCFM @ 90PSI