I'm from belgium, living just over 100 miles from the german border. After surfing the web I found several interesting mercedes websites. Most of them are German (I wonder why
Take a look at:
That's the german version, search for the car you want (make sure you check the "O Seiten aus Deutschland" box) and you'll get tons of information about Euro spec cars (MB's).
Has a lot of second hand Benzes for reasonable prices.
If your German isn't up-to-date try Altavista to translate the page for you, that works fairly well.