Hi Nicky,
I believe the BS4000/Overture was the first with Masterlink. The 8000/8500/9300/9500, 4500, or 6500/7000 systems do not have masterlink, but can be be connected to a BeoLink Converter, which essentially gives it Masterlink. If you like the shelf type systems, just get a Beolink converter to use with it, and you should be good to go! 