This past December I paid about $8500 for a 2003 C320 4-matic sedan with 98k miles on it. I'd say $10k for 50k miles is a decent deal.

I have put about 6500 miles on it in 3.5 months and I love the car. I commute 60 miles a day and we drove it from Chicago to Florida this winter. I am not sure how the wagon is but the sedan has a smaller fuel tank and a large fuel gauge which means that you can watch the needle move. I'm not sure how cold the winter is there but I was getting about 23 mpg over the last few months. We have had a slight warm up in the last week and I have been getting 25-26 mpg.

The V6 has plenty of torque and the 4-matic is very nice. I am trying to think of something negative to say about it but I really can't think of anything. I guess that maybe I wish I would have looked more at the E-class (more room) but even driving 1300 miles from Chicago-Florida it didn't feel cramped (granted I had a roof rack).

FWIW, I traded in my 2007 Saab 9-3 with about 35k miles for this car. The dealer thought I was crazy (he still took my money any way) and if I had to do it again I would not hesitate. It's a very good car.