I would also take the MP-4 over an 458. The Ferrari lacks heavily on image (where I live)

Björn - we had the SLS Roadster to test and there you dont have the problem with the door. Also - you can hear that noise even better. 

Gnil - if you are that kind of 'tracky' the SLS might not be your car, it is more one of those roadsters - long hood middle engine feelings, it doesnt give you that light front end, that you like. Even though it sticks to the track (just see how they use it as F1 safety car).