I travelled quite some way to get mine. I went for an older car that was a bit cheaper (roadster bought at beginning of the winter - so extra discount) but it was clear that it had been looked after and was supplied by an independent dealer with a very good reputation. The paintwork had some stone chips but they had been very tastefully dealt with, enough so that I find I am not drawn to them, if you see what I mean. There were one or two interior marks but there a good products and clever techniques out there to deal with most of that.
Having said that I saw some later cars that were really tatty. The worst one was at a Nissan Dealer - it wouldn't start, the roof didn't work, etc, etc. It just looked very tired.
Decent ones are out there, you just have to keep looking. As much as like Porsches, I still feel that there is something special about the 350Z - it has more emotional content.