Anyone else have problems with '01 E 320?

[stl-joe]

I own a 2001 E 320 wagon with 68k miles. I was just informed by my local dealer that over $4k in repairs are need on the car for:
battery $249
oil leak in valve cover gaskets $493
front brake pads touching sensor, rotors $725
ball joints x 2 $525
axle fuel leak, actually dripping $926
add freon and dye to check for slow leak $299.95

spark plugs needed soon $645
drive belt needs to be replaced soon, cracking $210

This car has been well-maintained, carefully driven (my wife and I pamper our vehicles), regularly serviced and always garaged.

This car is my fourth MB wagon. I have had great success with these wagons until now.

My principal concern is with the leaky head gaskets and transaxle. The car also appears to burn oil as I have had to add oil between regular services.

Did I just get a lemon or are there others out ther too who have had similar problems with this make and year MB?

I'd like to talk to MB's regional representative about these issues and, in preparation for that discussion, would appreciate any input anyone has to offer. Thanks.

St. Louis Joe.