You said C5, not C5 Z06. Can I also change to E46 CSL or E46 GTR?
Have you driven C5 Z06? I have quite a few times and aside power and 60hp difference from regular C5, it is largely the same trash of a car. Horrible steering, horrible feel, horrible seats, horrible shifter, horrible interior, horrible suspension, horrible fit and finish, horrible door panel gaps, horrible steering wheel. Boss owned one for a year and sold it after windshield weatherstripping flew off on the highway, mind you, on a brand new car. You need to lift up the entire car under front axle to drain the coolant. Design idiotism borders that of Audi engineers, at least the latter ones can build a quality vehicle.
So yeah, C5 is a better car than E46 M3.