-Ferrari F40 just screams, especially at WOT. That's just a street legal race car.
-Porsche 959, classic high power.
-Again with Ferrari, the Dino 308, smooth lines, classy car.
-Can't forget, the classic Mercedes 300SL, the 55 of course.
Just a small list, sadly nothing modern, if I were to have a modern car, I'd go with the Ferrari 599 GTB Fiorano; Enzo power, typical Ferrari luxury.