I upgraded from the 803 to 802 Nautilus (not the Diamond Series). At that point, the 802 had a much bigger sound stage. I now drive them with the 350 watt MF TriVista Integrated, which is a great match -- head turning. If you are going to buy the Diamonds, you should invest in something better and more powerful than the Rotel. The Classe sound very good, but not head turning IMO. Because of the B&W somewhat bright sound, the MacIntosh might be a great fit, as long as you have at least 300 watts of power.