Price when new: $54,075
Dealer used price: $34,155
Private-party price: $32,710
Certified used price: $36,437
MPG (city/hwy): 17/24

Mercedes' most popular sedan is sleek, boasts lap-of-luxury appointments inside and has a used price that's nearly $20,000 less than its new-car price. Plus, you get a full complement of safety features, including Mercedes' Pre-Safe, which anticipates an impending crash and cinches seatbelts and closes windows.