@OP There are a lot of used Wilson speakers around because people upgrade to newer Wilsons.
On B&W's - there's no guarantee you will like the latest generation better - they are certainly not a speaker I would choose for chamber music.
Magico A5s are worth listening to - more evenly balanced that D4 B&Ws but somewhat similar in character.
Personally, I would prefer the Sasha DAW but, while the thread is not about digital, I would not compromise the budget for a digital front end upgrade because, especially with more modern speakers, you are really going to need it.
In fact, I would suggest looking at that before changing speakers at all.