I came back to 370z after having a 350z few years ago, in between had mini cooper s jcw, civic type r and an audi a4 3.2 convertible(proper had a brain blip on this one). One model hasnt been mentioned and thats the gt ultimate which i have. Only came upto 2010 i think so early car but same as gt spec but with orange leather and suede interior. Just makes it a bit different.
Look out for the nav. In mine its a dvd based ssystem, works fine for me i think post '60 reg its the premium nav which is harddrive based and has full usb integration and touch screen.
Depends what you want, i wanted different colour interior over the other bits, i still have sat nav which is what i wanted and have aux in for music.
I looked at caymans, boxsters etc and they are so boring inside plus lot older for same money and extras are few and far between. I picked up a fnsh 370z gt ultimate 24k miles for £16300. And proper service history to the 12 months not mileage which was ace.
Just shop around. Dont rush and get the one you really want. I love the 370z because its not sofisticated! Its not a bmw or audi or porsche. Its special. Stuff like m3 is nice but in my opinion isnt as smart as the 370z.