LOL. It would be pretty bad to take the R8 out there and get wrecked by a Cayman. It's quite possible too, I'm no Mario Andretti. I can pilot a Go-Cart as well as an elderly asian woman in a beige Camry so I'm not expecting much better on a real road course.
Ehh, the point is to just go out and enjoy yourself. You probably wouldn't have fun in the R8 cause let's be honest, you would be afraid of crashing it. I love taking my other cars to the track, I have the NFG attitude. Bash one of those into a wall, owell, shit happens... Even though the WRX is a lot more expensive than those, but I'm sure you'll still be less afraid of something happening to that.