nh500sl has good taste in cars, IMHO. Cadillacs from 1965 through 1976 are some of the nicest cars ever built. I discovered Cadillacs by accident in 1974, my junior year in high school. Gas prices spiked (premium went to a whopping 70 cents per gallon!), so people were unloading their gas guzzlers. I got a pristine 1965 Coup de Ville for $800. What a creampuff that car was. Handled great. It had the nicest interior I've ever seen on a car.
Look at this 1966 on ebay:
http://cgi.ebay.com/ebaymotors/1966-Cadillac-Sedan-Deville-62000-miles_W0QQitemZ260154497629QQihZ016QQcategoryZ6146QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Look at the picture of the front seat and dashboard. See how the glove box is in the middle? It created enormous leg room for the front seat passenger and made for a really clean appearance.
I have not driven every luxury car of that era, but I would take a 1965 or 66 Coup de Ville over any others that I've been around from that time, including Benz and Rolls Royce.