Between GT4 and new NSX, my vote is gen 2 R8. Not biased, since I own a gen 1
To me the NSX is a much better looking Nissan GT-R. Just another numbers car. And the GT4 doesn't really do anything for me aesthetically. It's more of a driving tool than an emotional attachment for me. To me the R8 is the happy middle ground with an N/A V10.