I am considering the purchase of a 1990 Quattro 90 Coupe. Car is in very good condition. 75,000 miles. Most options. Needs new rims (factory rims are covered with nonremovable amounts of disc dust. Current owner is definitely an Audi person and seems to have taken good care of this Q. Any inherent problems I should look for. Car is in New England. What is a fair price??