I like the idea of a diesel too. I love my in-line 6-cylinder and the mileage is OK, but the diesel would make me feel more ecofriendly. In this day and age, better mileage and options for alternative fuels, seems very appropriate. Supposedly, you can run the diesel on cooking oil or some other renewable fuel source.
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I just couldn't give up on my 1995 E320.

I think it might be like always going back to that same bad relationship with an ex girlfriend.
You feel you love them too much, or you are just too stupid to know any better.
Flickr slideshow of my 1995 E320
http://www.flickr.com/photos/24145497@N06/sets/72157616572140057/