So I'm totally kicking an old thread but my last post promised an update. Well, I bought that C55 AMG I mentioned and I LOVE it. Purchased end of January with only 74k miles from a single owner. Seller was a really nice nearly 80 year-old retired Superior Court judge! He kept all records and did all maintenance when it was due. The only common things he didn't replace were the valve covers (they weren't leaking) and the CPS. All else was done on schedule. Car is fast as hell and although I still love the E55, I feel better not worrying about troubles and expensive repairs. The best part, the wife let me keep the Dinan E34 M5! The best of both worlds!
I wonder what the OP decided?
'91 E34 M5
Dinan 3.6 Stroker, Tune, Exhaust, Sways