I would make sure that it also has the ESP. The heated seats are nice in winter too. Make sure you get a set of snow tires for winter. Mine will swap ends in a turn in snow if I am not careful since I only have all season tires.
The newer 4-matic system works great and has built in traction control and will balance the torque from front to back. If you notice the traction control kicking in, slow down.