Since you live in Florida, I would say you should be fine. I know the roads down there are X1000 better than up here
. Really it comes down to whether you want all the "luxury" features or not, as a previous member had said. If you don't want leather, bluetooth, bose, etc. then go for it. The 370z has a tight suspension regardless of trim level, it is a sports car so you're going to feel bumps. Granted the Nismo is a little tighter. I wanted all the goodies when I got my 370z (touring with sport package) so getting a Nismo would be a tough choice for me because I absolutely love the exterior.
Summary: If you're considering a 370z for your daily driver, the Nismo will be just fine.