You think the R8 has a good performance to cost ratio? Moron.
Stock cars, Subaru is faster around the Nūrburgring than the Porsche Panamera Turbo, and about $100,000 less.
http://m.automobilemag.com/features/news/lap-of-hell-2011-subaru-impreza-wrx-sti-laps-nordschleife-in-755-3533/
You wanna spend over a hundred thousand dollars on a “track car”? Build one, idiot. If you’re so concerned about cost v. performance, you shouldn’t even want to speak the names of those companies. Funny you think Lamborghini is just a name for people to brag about and Porsche isn’t… BTW.
http://m.youtube.com/watch?v=PhiP2kQjWNQ
This “only” 450WHP Impreza would slaughter anything previously mentioned in this thread, And the performance is obtainable, plenty of helpful people out there with the knowledge to do this stuff. And I bet it would come out well under $150k.