Ejko:
Bought the 2004 coupe and I really love it. The 6 speed is so much fun to drive, summer or winter! Yes, I said winter! -20 and the all seasons work great. I said it before but it needs repeating. For a car that is front end heavy, it does actually move on ice! As far as the notchy shifting goes, you will find that you need a few days to get used to the throttle pause. When you do, it is a smooth as silk. You can get your cpu chipped to eliminate the pause from what I have read and it ups the hp about 5-9 but I am going purely by memory now. It is a company out of Florida if I am right. I am sure one of the guys on this froum could turn you onto the right place.
After looking at the same cars as comparables to the Xfire, I was close on the 350Z but in the end I am very happy with my choice.