Advice from Audiogon family - best speaker $3k-$4k

ProAc is a serious contender. When I went from Sonus Faber to ProAc (monitors) I never looked back. They are extremely dynamic, big soundstage, punchy, completely non-fatiguing, smooth. a DT8 will knock your socks off…good luck on your hunt!

Spendor A4's....

Curious that you like your B&Ws but also Sonus Fabers. They're pretty far apart on the sonic spectrum.

I’ve compared several B&W speakers to Joseph Audio, and in every case the JA speaker was superior on every level.  You can pick up a nice pair of JA Profiles for only $2800, which is a great price.  Frankly, I wouldn’t be surprised if they significantly outperform your 804 D3s that I’m very familiar with having worked for Magnolia.  If for some reason the Profiles don’t work for you, you may well be able to resell them for no loss or even a small profit.  Go for it!  You will not be disappointed. 

https://www.ebay.com/itm/265698051503

Nothing wrong with Sonus Faber.  If you are looking to compare check out KEF.