2007 Mercedes-Benz E-Class E550 4dr Sedan (5.5L 8cyl 7A)
I bought a used E550 and it is the best car I have ever had - balanced, powerful, smooth, ergonomic, roomy ....
love that V8 and cannot ever go back!
I have had 3 Mercedes, a Volvo, a BMW (M3), Saab, and several Fords.
I have also driven my parents 4 Mercedes.
The E550 tops all of them combined.
It has 382 horsepower but I get 28 mpg on the highway (25 if I goose it).
It looks sedate but keeps up with unwary Porsche and Corvette drivers.
Fantastically smooth driver on the interstate with fantastic response for passing.
Right now, I am shopping for an convertible (for fun) but cannot find anything as great as my current E550.
Maybe an SL550?