To help you in the decision making process consider this: A full bolt HR 350z with a tune will produce ~320WHP. Budget for all these mods will be ~2k - 2.5k and that's including labor.
Also, it depends on how much modding you really want to do with your car. If you get the Nismo 370z, you exterior modifications should not even be in consideration, same for Nismo 350z. It's their exteriors that sets them apart.
Now you can do a little calculation on how much modding 370z is going to cost you, and the price you're paying for it, and then see if it's really worth it.
Haha no sentence check/grammar check. So it might be a little difficult to understand ^
