I had a thread like this once but with illigal roadcars (racingcars) too. I’ll show you some video’s from the cars which you may not know…
If I hjad the money, I would go for the new lexus LFA or the maserati grantourismo S. These cars have such a beautifull noise and that’s not all of it. These cars are going around the 300km/h I can’t do anything with a veyron or an SCC aero TT which go around 400 or even a lambo which goes around 350 because I live in Belgium and in Belgium it’s illigal to do it anywhere else but the tracks of course… Collor would be silver or Black. LFA: http://www.youtube.com/watch?v=ho1KSeiWV4Q
If I didn’t had the money, which is more realistic, I would go for the Volkswagen Scirocco. The ones you saw at the ROC are the R type, but that’s too expensive. Collor would be Bordoux or how do you call it? Verry dark red?
My racing car would be the RB7 ofcourse but other then this I would go for the Lambo murciélago LP670-4 R-SV: http://www.youtube.com/watch?v=go6kxyKSDZ0 . even if it only is for a day that I may use him. I would just go for it. The sound of that car is saying enough!
Btw: check this list out to know the fastest car in the world: http://www.thesupercars.org/fastest-cars/fastest-cars-in-the-world-top-10-list/ (I won’t go for the bugatti, it’s too ugly, I would love to have the Agera, it’s fast enough for me and the looks are stunning, but that’s just personal)