[ssump29]

Without being bias I would say the M6, since I own one of those.

Here the thing the M6 is a great car, I have had zero problems with it for 4 years now and I'm at 57,000 miles with it. Z06, let me know if you are interested because at one of the dealerships here they are selling them brand new for the price you have listed here at Pasty Lou in Flint, MI.

All those cars you listed besides those two I mentioned I would not buy used. Heres the thing to think about though, can you afford the maintenance of the high teir cars. I will tell you keeping the M6 maintained can get quite expensive, try an oil change that cost 200 dollars once you are out of the maintenace warranty. If you can't afford the long-term maintenance on any those cars I would suggest you just get a brand new SS.