You may want to consider Audio Physic, if it's imaging you are after. My sense is that AP may be peerless in this particular area. Virgo III, or a used Avanti may be ones to consider. Ones you're sitting in the sweet spot, the speakers literally disappear. That's the unique quality about this line that made it quite a hit. I guess I may be biased - I own a pair of Virgo IIs, but I used to own B&W Nautilus 805, and had a friend with N804. Apples and oranges from a comparison perspective, but I certainly found the Virgo II to be a step up in many areas - most prominent of which was imaging. Good luck with your search.
New speaker with imaging
I have a pair of B&W matrix 804's, original owner and about 12 years old. I like how they sound with timbre and dynamics. I have a high current amp. I mainly listen to orchestra. I would like something with better imaging and less as a point source. I want the B&W sound however with imaging that spreads about 6-10 feet wide at my listening position about 8-10 feet away. Can I get it for under 10 grand? My short list includes Legacy Focus and Von Schweikert VR4-jr or VR4.