I bought my car for 8000, which included all new Michelin Pilots, a 'new' clutch, and a new convertible top, the car had 56k at the time. I think you could ask 8000 and have it knocked down to 7500 and get out pretty good. You have to remember that it's going to be a little harder to sell and your going to have to flex a little with the price because it is winter time, and Mustangs don't have a great reputation for their manners in any type of wintery weather.
Joe