I haven't driven much cars. And though there are many super cars that could be seen as a dream car..
I'd probably say a GTR, or an Evo. I'd want a drivable mostly small and not overly wide one unlike super cars. Decently fast on a straight, has to be way faster than a normal road car, but the thing I want is the ability to turn. I like muscle cars and that they go fast in a straight line, but I love to take fast turns.
Though if I lived in an area with good wide roads... I love the sound of Ferrari's.. makes my chest tighten or something, feels like a cold hand embraces my heart and I cringe when I hear one rev.