Hi Guido...I feel for you man. The hardest thing for a car freak is to know when to stop!
I just posted a 1990 Car and Driver review of AMG's 300TE V-8 conversion on my website and was struck by their comments that AMG fiddled too much with a good thing (the stock suspension) and ended up with a whole bunch of handling problems.
"Lead, follow, or better yet, get out of the way!"E500 owners motto