There are two types of 370z owners, those who love the nismo and think it's worth it, and those who don't.
Neither side can/or will be swayed by the other, as evidenced in this thread. If you are not sure if you want a nismo or think it's worth it, my guess is it's probably not for you and you should go w/another model.
Me and the wifey love our nismo and it was the only 370z we even considered. (briefly thought about a 40th anni, but when seen next to the nismo in person, no contest).
Aero/bodykit on the nismo is functional, not for show and fitment is oem. Wheels are great and on par w/ any RAYS/volk aftermarket, suspension, for a non adjustable/coilover setup is about as good as your going to get for track use.
Could it use more power? Yes
Could it have better brakes? Yes
Could it use and Oil Cooler? Yes
But any Z you get needs those things and quite frankly, just about any "street car" no matter how "sporty" is going to need at least 2 out of those three things as well.
We have zero regets getting the nismo and if we were to do it all over again, we'd have the same car sitting in the garage. Regardless of what you choose, as long as that's how you feel, you've made the right choice.
At the end of the day we're all Z enthusiasts and that's the most important thing.
alright I'm going to stop now since I'm starting to sound
