Like many above, I looked at the 350Z too.
Not being a badge snob, the quality is simply just not as good as BMW.
Too many cheap plastics and obvious parts from the same parts bin as their cheaper models. Build quality simply not as good.
What summed it up was a good friend of mine who has one - he always goes on about how his is 1 second faster on 0-60 than my 3.0si.
He finally had a chance to come for a drive in my Z a few months ago and was astounded by the BMW build quality and interior. Just a much nicer place to be. Nissan can't touch BMW on this one.
You wouldn't think twice if you you were comparing a Nissan and BMW family saloon would you?
S