It's going to depend on what you want. The 350z is a more potent sports car than the crossfire. It's likely faster in all areas. The VQ engine is a staple of the nissan lineup, so I personally would not worry about reliability. They are handsome cars, but the interiors are horrible. I just couldn't put myself in one for a prolonged period of time. For me, I'd rather have something unique and different. Plus I seem to have a fondness for German cars, so the crossfire represents a better value to me.

Having said all of that, I'd have a very hard time turning down a slightly used 370Z. I really like those. I would potentially have to move to the darkside for one of those!