You're right, Robiferretti, this is the NSX forum, so be prepared to be inundated with pro-NSX, and possibly anti-Vette, opinions.
That being said, the choice you make will be based on many different factors. For me the overarching factor was refinement. Yes, performance was high on the list. In fact, I thought that performance was my top priority in a sports car. But in real-world driving 0-60 times matter little. As do top speed bragging rights. Ask anyone thats done 160 mph in their car. It's scary and 5 or 10 mph more is scarier still.
I was about to pull the trigger on a P-car when I was persuaded to test drive the NSX. Powerful, beautiful, comfortable, I was sold almost immediately.
The NSX will perform with the best supercars, it is exclusive, it is brilliantly designed, highly refined, and, get this: dependable!
The NSX will not embarass you at the track, where all your racing should be done, and it will be extremely rewarding on club drives and weekend blasts through the country. It is not the fastest car on the planet, but spend some money on driving school and you'll be faster than lesser drivers that have faster cars.
I'm rambling now, but like I said, in this forum you're going to get a lot of NSX love.