2012 SUZUKI GSX-R 750

This is a Mark Junge-built AMA race bike with Traxxion/Penske/Brembo suspension and braking—basically a turnkey club racer that's barely been ridden since its last full service. For $6,500 with a box of spares and documentation, you're getting race-proven engineering that would cost 3x this much pieced together, making it the rare find that bridges the gap between weekend warrior and genuine track credibility.