I was wondering if this is a good deal or not? I saw a 1999 Cadillac DeVille D'Elegance sitting on the lot with 40,000 org. miles. The salesman was asking 8,000 but I talked him down to 7,500. The car is in perfect condition and comes with a full service, detail, and carfax. However, I am worried about the Northstar and the stories of their headgasket failures. Any help would be appreciated. Thanks, Mark.