The R-Class from Mercedes is a luxury crossover that should be on the radar. Its spacious 7-seat interior, bathing in the light going through an expansive panoramic roof, offers 1st-class accommodations for all passengers and long-distance comfort. The front section of the glass roof opens-up at the touch of a button. The R-Class comes standard with the 4Matic all-wheel-drive system, teamed with two V6 engines: a 210 hp 3.5 litre turbodiesel (R350 BlueTEC 4Matic) or a 302 hp 3.0 litre (R350 4Matic).