Don't forget the 2003-4 Mach 1s. Look for one private sale (dealers are interested in being car museum curators, not in moving them) that has a reasonably clean interior. Accept some body hits from parking lots, etc. The Mach 1s would take lots of drag racing and return home, laughing. Good weight, easy 12 second quarters with little effort, and New Edge looks with a great factory sound system. My vote, anyway.
One could make your $7500 cutoff....at the mileage you mention.