I happen to love the sounds of the Z motor throughout the entire rpm range.
and if you plan on modding the car then I would advise against a Nismo. They are terrific cars but you're paying for the suspension(that you'll probably upgrade), the exhaust(that you'll probably upgrade), and a body kit
...oh ya, the wheels are nice though.
At least with a touring model you'll get heated leather seats and some other goodies. The BOSE is alright, keeps the weight down and sounds ok, not stellar. Possibly NAV if you choose that route, auto dimming mirror with garage door openers.
In my personal opinion, somebody who mods their car would skip over the Nismo because you'll be paying for parts that won't be on the car long anyways.