$8k for speakers - new or used

Why does everyone tell everybody else to buy what they own? B&W 804D3 will have plenty of detail, more than most in fact. Try moving the speakers around a bit, toe in, closer to boundary's while aiming them at listening position, you know the drill. I love my Mac gear and it's much better in all areas compared to previous components, but maybe you need to try something different just for reference? I often get the bug to change speakers just for the sake of change, but I usually end up missing the specific attributes of the brand I'm most used to.

  That said, If you have the room to park a pair of speakers 3' or more from ANY reflecting surfaces the Paradigm Persona line will AMAZE!!! I sold my pair of 7f after a year or so because that's what I do, however I auditioned them over a year before buying(dealer is a patient man)and can say with confidence they have a very high ceiling. They have bass for days and don't need subs. I can't think of any other speaker a B&W 800 series owner would consider competition. 3f should be a drop in replacement for the 804.

I agree.  People just want to spend and upgrade.  Those B&Ws are fantastic speakers and it's likely you have placement and toe-in work to do, maybe room treatment.  The speakers are winners. 

Hello OP and @steve59 

Why does everyone tell everybody else to buy what they own? 

Honestly just speaking from experience.  I have owned three pairs of N802s and a pair of N803s. I still have the one pair of N802s.  To me, this was the heyday for B and W speakers.  The Revel Salon 2's are, to me smoother and sweeter sounding than any of the 802s, play deep and large in a big room, and never make me cringe.  I can not say that about the Persona or recent D series of Bowers and Wilkins, and I have demoed both several times.  Just my opinions.

Asking other people to pick out a speaker for you is akin to asking us to find a girlfriend for you. Speaker choice is more personal than any other component. You really need to go to an audio show and listen for yourself. 

Here’s a pair of Joseph Audio Perspective 2s near your price point (they do have some minor damage that is what brings them to your price level).  I got to hear the smaller Pulsars and your 804 D3s in the same system and hands down thought the Pulsars were better all around.  Amazingly bass was comparable and the Pulsars were the equal on detail but sounded more natural, musical, disappeared and imaged better, and threw a bigger and more expansive 3D soundstage.  The Pulsars were just more effortlessly enjoyable and believable overall whereas the D3s called attention to themselves while showing their relative limitations.  It’s not that the D3s were bad — in fact I liked them more than any previous iteration of the 804s, but the Pulsars were just flat-out better overall. No contest in my book, and obviously these Perspectives would give you even more in terms of bass impact/depth and overall dynamics than the Pulsars and the D3s.  Just another option, and best of luck. 

https://www.usaudiomart.com/details/650134918-joseph-audio-perspective-2-graphene/