Hey i have had the same question. about price and even should i sell.
here is what my E28 M5 stats are.

All stock except B&B Cat Back.
2 sets of wheels. Stock bbs w/ new P6000 (in storage/ perfect cond)
second set Style #32 540i 17s with new tires
Dinan chip from new
Optional Fuz buster (in dash/ airdam)
80,145 miles
Stock BMW and Alpine head units
Never tracked, raced, ragged out, or Divers ed days
Near perfect original Natural Interior no tears or rough threads. leather is still baby soft. no cracks at all .heated seats, ac, everything works
Absolutely georgious paint and ext.
All original except exhaust and second set or wheels.
Self leveling rear shocks work perfectly.
Absolutely everything works perfect and looks the part other than head rest are stuck down (but motors work with switches).

I litterally looked 5 years for this car and in the past 3 years have put 12,146 miles on it with nothing at all going wrong. It is the closest to perfect E28 i have ever seen. I am the second owner, other than a guy who bought it for 2 weeks for a track car then sold it to me bc it was way to nice to track.

I am new to Road fly and have some picks but am not sure where to post yet. I am detailing it this weekend and hope to have more picks.