I would use a 78-80 Pontiac Grand Prix or a Cutlass from the same years Mostly because you can tell a lot about a man's character from the things he owns, and I do like the idea of a shy quiet girl with a shitty late 70's coupe
The Mercedes Benz CLK GTR. The reason why is it has a good speed, very attractive, fun to hear and drive, and seems like a car great for racing in multiple ways, or for chilling down urban streets in the road version.