I judge track toys on a different scale than street cars. As a street car (not sure if possibly in US), the Zonda R is way too fugly. As a track toy, it is way too expensive. Better to get a Lambo and a Radical for that money.
The Huayra looks a million times better, but I'd still prob get a Lambo + Radical instead.....
Not sports car at all, but I was always fond of the sound of the V10 M5 with a mild exhaust (like Dinan). Screaming toward 8250 RPM under WOT, it was certainly the most glorious sounding family sedan ever produced.