What you shouldn't forget when discussing the price: The R8 is built here in Germany. And right now 1 Euro is worth over 1,3 USD!
So IF the R8 is beeing offered for around 120k in the US - That's a hell of a deal! That's around 92k Euros. Compared to the 104.400 Euros MSRP for the base model (http://www.audi.de/etc/medialib/cms4imp/audi2/product/r8.Par.0002.File.pdf)
So you could even get the car ALOT cheaper then we do here in Germany.
I'm not an Audi-Fan. But the first time I saw this car in Person I fell in love...

It needs a V10 to command that price. The problem is you can get a V-10 M5 for $30K less that seats 5 and will annihilate the R8 on the highway.

How do you know that the M5 will be quicker on the highway? It's got more BHP, but also heavier. If the point is +$ = more speed than get a Z06...fully loaded for $76k.