I can tell you that no planetary or rotary will replace a belt sander completely, they have their uses but if you want to go into wood floor restoration properly you will still need a belt sander and an Edger, an ROS and extractor are also handy
A decent belt sander new is around £4000 plus vat, Edger around £1300 plus, ROS and extractor around £700 if you buy Festool.
Terry