I'm completely in love with the G37... GET IT! I'd say its probably the better looking of the three. Which Cadillac coupe are you talking about? If there is only one, please excuse me for my ignorance. The c230 is a decent car, but Mercedes can hasn't kept up with the rest of the auto world in quality, but they have in performance and luxury... just don't expect them to run as long as a Toyota would.