I doubt the 803S is better than the 802N, but possibly the 803D is with the diamond tweeter. Still, the old 800 Nautilus range is excellent and worth buying at good prices.
B&W Nautilus vs Nautilus
Just thinking out loud but I've been thinking the average John doesn't know the difference between the two, which is why the older Nautilus series is commanding good prices in the robust B&W secondary market. My dealer mentioned that the 803S is pretty 'up there' with the older 802 Nautilus, maybe better. Comments?