It's not always an easy call. This is coming from a guy who traded in his modified Audi TT in Feb. for a new Goat, so I understand where the "Luxury Sports Car" guys are coming from. They are fun and refined, but I will tell you that I truely felt the GTO's fit and finish is easily as good as some of the import stuff, and it pulls the same Gs on the skidpad as a Nissan Z, and that's with a stock suspension. My neighbor has a G-35 and I drove it, and I can say that it is slow. I kept waiting for the cam to kick in at high revs or something, but nothing ever happened. Everyone thinks their car is fast, because they have no real point of reference. I drove the GTO and it really did make me laugh, there is no comparison between the two motors. I haven't just beat a couple of G-35 Sport Coupes but flat out embarrased them, hell I just walked away from an STI yesterday from a rolling start.
You will not find a more complete performance package for the price in the GTO. If you want more aggressive styling, more amenities for your daily commute, and don't mind getting put in your place by a lot of other sports cars out there, get the Infinity.:cheers
P.S. Hardly any aftermarket go fast parts for the G