Not to knock bimmerfest, but bimmerforums has a separate forum for E24 junkies. If you are serious about looking for an E24, there are many forum members who are experts at providing all the support required to find, purchase, maintain and upgrade your 6er.
Apparrently, you have already gone down that road...One of the members there told me when I was looking for my first ever BMW and 6er...
If you are only thinking about getting a 6-Series, its too late, you have already bought one.
He was soooooo right. Two months later, somehow I ended up with two. Let the addiction begin!