That's a great write up. I'd just like to throw in a couple of pointers if I may. Firstly, I can't fault your views about Nissan dealers. I bought my 370z in November, and although I was really excited about getting the car, the whole car buying experience was something I'd rather forget. I don't think Nissan dealers (or many others in my experience) go through any customer service training whatsoever, they just seem to be focussed on squeezing as much money out of the customer as possible. My car was even handed over to me with an almost empty tank of fuel... not happy!!!!
But about the car... unfortunately I never owned a 350z so it would be pointless me trying to give any opinion on your comparisons with the 370. All I can say is that after 4000 miles of ownership the car still feels as awsome to drive as ever...!! I guess you just get used to the limited visibilty (I don't notice it at all), and I actually prefer the lower seating position!! I also have the 7 speed paddle shift version which I think is great fun to use, but then I guess that's just down to personal taste at the end of the day.
I'd be really interested to hear other opinins...