If you do not have to have a 4Matic, then do not buy a 4Matic. The repairs are considerably more expensive for the front suspension, axles, and transfer case.

Problems are not wide spread but torn boots and leaking transfer case (at this age and mileage) are not unusual.

As you can see, I have a 4Matic wagon (adds another 200 lb for the wagon in addition to the 200 lb for the 4Matic).