For a daily driver I would recommend the Touring + sport. You can match the Nismo in performance with a few upgrades. Just my .02 though.
As far as warranty goes, take some time and read around the forums.
Here is the warranty booklet for the car:
http://www.the370z.com/images/370zfo..._Coupe_WIB.pdf
There is also a section of the forum dedicated to warranty/service repairs/ etc.
Good Luck!