One thing to think about if this is fun car, is how you like your power delivery. Having gone from a 400+bhp rear wheel drive car, to a Focus ST and now the 350z, I find the Z has a really smooth power delivery which can be a little deceptive, it doesnt feel as fast as it is, it's quite linear in its power delivery. If you want something that will thump you in the back and "feel" fast, you'd be better off with something rear wheel drive that has a turbo, plus you have the benefit that these tend very very easy to tune for the most part with minimal outlay.
At home we now have the Z and a Seat Leon Cupra R, I can honestly say the both of these cars are very good, neither has a massive advantage in terms of outright speed, but they are massively different in the way they drive, the Cupra and the ST are great front wheel drive scrabble wagons, but you feel like your driving an excitable puppy that's always straining on its leash yapping all the time, the Z is far more composed, it'll do everything the ST and Cupra can (and some) but with much less dramma, although like any big dog if you poke it with a stick, it'll still bite you
Personally I think the Z looks better than any hot hatch ever could, it sounds better, and it's a much nicer place to be than most of the cars I've ever owned or driven, it may not be the fastest car ever built, but it makes me smile every single time I turn the key.
I get to choose which keys to pick up every morning, and eight times out of ten I pick up the Z keys (the other times I'm half asleep and pick up the wrong ones...).