If you like the B&W sound you have now, by all means, stick with that line. As suggested above, the 803D would be a substantially improvement over what you have now. And at 8K with a discount, you'll be doing alot better than your budget of 10K. And you'll have a speaker that you will hopefully enjoy for quite some time, and also have great resale if you decide to sell.
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.