I'm tired of people bashing the NA Z's, they probably never owned an older generation car to really appreciate what they have now. Why do they think it is a waste of money to make an NA car nice? Every NA Z car can be a lot of fun and a great all around drivers car without much money spent.
People can be very happy with an NA Z. They are also easier to come by (6 NA Z models vs 3 turbo Z models). It's my opinion that you also become a better driver when you don't have a ton of power to rely on. You learn to shift better, get the most out of every gear, and value a good suspension setup more.
Just my 2 cents, after owning 4 Z's from 2 generations, only the latest being TT. I bought every one of them because they were a great car, not because they had more power than someone else's car.