If your going for Vortech then this thread is essential
http://my350z.com/forum/forced-inductio ... tions.html
I read through this thread loads of times when I was researching kits
Check out the classifieds on my350z, there are quite a few S/C kits popping up for sale. Also be careful buying turbo kits from the US as some of them dont fit UK cars.
Good luck doing it yourself, make sure you keep a progress thread for us to see