i think a good 5000 s is a 55.000-65000 euro car.
i have seen a perfect one with 9.000 kms all papers , perfect show condition for 80.000 euro, but it is no buyer for it yet.....
i think you should offer around 40.000 $, or little more if the car loocks good, for a car you don't know more, so it will be a sure bargain!