If im honest, I wasn't really interested in the GT when I got mine.
Heard the leather seats are less grippy than the cloth and im not a fan of heated seats, the sat nav is pants, I never use cruise control and the Bose was a bit sensitive to things like turning it on, being cold, being warm or if the day had a Y in it.
Oh and the not making quick decisions is a good thing when buying a Z Buy with your head and not your heart. Find the right one that's been looked after, there are a few member cars up for sale at the moment i'd start there.
Edit:
Like this one for example
http://www.350z-uk.com/topic/113965-2006-350z-gt-facelift-71k-price-drop-7050/#entry1697601