I'm confused, you said regular consumer and solely track purposes ... ? Very different vehicles for regular consumer car and track day car.
Both are good street cars and nice on the track, especially with a few light mods, but there are more rewarding/purpose-built "track only" specials to be had for E9x, 370z money. Think Porsche (Cayman R, S, 996/7 GT3), Lotus, etc.
Professional racing isn't really an indication of how well the cars will perform in an individual owner's hands because the ruleset is made to equalize the car (weight equalization via ballast, allowed mods, even restrictor plates in some series). The cars should be competitive. Also the drivers make a world of a difference.
M3 Sedan - AW/Black - 6MT - no moonroof - no folding seats - RAC RG63 - clear bra by Omega Werks