I would be more hesitant to buy a cobra with 500-1,000 miles on it than I would be to buy one that had 6,000+ miles. With a very low mileage car, you have no idea what you are getting. The engine is just off the break in
oil! If a car has only 500 miles on it and is a couple of years old, that means that the break-in period was stretched over 2 years; not a good thing in my book. Things haven't even had a time to loosen up. Some issues take time to develop. I concur with a prior post in that, always expect to pay a few thousand dollars more for repairs over the next several months just in case.