At present I have a 240D,but am thinking about getting a Benz with 4-matic drive.What is the "best" model year? Were the early versions troublesome?I'd like the earliest year,assuming it would be less money,that wasn't a "bad" year for 4-matic.Also,I'm guessing the older,the less complicated the car.Is there a diesel 4-matic?? Thanks for any help.