Looking into a Z

[steelertown]

Hey guys currently shopping for a new car which might end up being a Z! I managed to narrow the search down to a 350/370z, g37, Brz, Mustang v6 premium. ATS and the new cla250 also caught my eye, but since there is obviously no used ones, it is pushing past the point I wish to spend.

I really like the 350/370, and have done a ton of reading on them. Two requirements in the vehicle I buy is reliability and reasonable to cheap maintenance costs, but at the same time I don't want something boring. From what I have read, these vehicles seem to be reliable, but its my impression from reading (correct me if I am wrong) the cost of ownership on the Z may be high. Tires, gas, brake jobs are some things that come to mind.

I have a few questions in regard to the Z I would appreciate if could be cleared up:
1. Any particular year that has the best build quality & least issues? Seems to me 07, 10, and current year models would be best? Any year to avoid?
2. What kind of miles can I push out of tires for these cars? obviously I read stocks are bad, I am talking about a 3rd party set.
3. Any odd services that are pricey I am not aware of? An example is my current car Ive driven 50k miles and all I have payed for was oil changes, new front brakes/rotors, and 2 sets of tires. Could I expect something along those lines?
4. Are these long lasting engines? ex. is it safe to assume its going to 100k no problem?
5. Long drive comfort?

If I buy used its going to be low mileage due to this being used as a DD most of the time. I found a 2007 350 locally with only 9,000 miles but the guy wants 23,000. I feel this is over priced, opinions?

This was much longer than I wanted...lol