I can comment on this, as I have both a Z (just picked it up today though!) and a 2008 G35x Sport (4 door).
Based off of my *very* brief Z ownership thus far... If I had to have one, it'd be the Z. Nothing feels quite like a true sports car, and the Z is a true sports car in every sense of the term. That said, the G is infinitely more practical, rides a lot smoother, and has a gorgeous interior with room, all of which may be important later in life. As someone said before, the steering in the G is quite a bit lighter, and while it has great road feel, it doesn't feel like a true sports car.
In sum, they are both awesome - But knowing your situation, the Z would win in my book.
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