These upmarket American rides deliver top-shelf appointments, comfort, and convenience at an unbeatable discount.

Any judgment on the greatest luxury cars of all time must probably seek to define luxury, which, in the car world, is synonymous, most often, with comfort, which is the essence of Rolls-Royce.

But it's secretly one of the rarest examples in the world. It's an S63 AMG. Such a model was not offered in the U.S., and few ...