One point I would make is that my first 'modern' piece of B&O was a 5000 stacking system - which is the only system I have let go from my collection. Much as I liked it and the way it looked and sounded, it was probably the least 'special' system that I had and when we moved house I didn't have the space for it any more...
For what it's worth, there's no way would my Beomaster 8000, 6000 Quad, 2000 or Beolab 5000 have been let go. I get more satisfaction from using these items than I did from the 5000 stacking system.