The Porsche will bite better off the line, however I think the NSX is a faster car, and believe it or not the NSX handles quite a bit better. The Porsche is a great car because you can drive it all year. I had it in 6.5 inches of snow last week with no problems. If I had to pick one it would definetly be the NSX.
I put a few pics of the NSX on imagestation also. I will post some pics of the engine work and what how it looks installed soon.
Happy Holidays
Rob