Full Range under $5k-ish

Dep 14 I agree with you.

I heard a pair of Salk Song3 Encore's at the Rocky Mountain Audio Fest last October and thought they were one of the best speakers at the show.  At a cost of $6,000/pair they crushed a pair of $60,000 speakers I listened to.  I also met Sim Salk and he is an incredible guy.  He told me he sells direct so he can afford to buy some of the best drivers in the industry.  He said a lot of speaker manufactures who sell to retailers have to cut their prices and in order for the retailers to make most of the money you have to purchase lower quality drivers and manufacturer lower quality speaker cabinets.  He is not willing to sacrifice quality at the customers expense and sit back to allow the retailers to make all of the money.

I have owned Wilson Watt Puppy 6’s for 10 years and which are around £4K preowned and full range. 

The power amp amp needs to have excellent dynamics because the ohms can drop from 4 to 2 and even below requiring large reserves of power to be needed quickly.

I have found that a tubed pre into a class A power gives excellent results.

At new and based on your less than 5k budget I would strongly consider and recommend  you listen to Vandersteen. There is a reason the model 2 have been so popular for 40 + years. Maybe they won't fit what you are looking for but ANY recommendation of a reasonably  priced "full range" speaker should include the Vandies. If you require more bass you can add subs later. 5k on a full ranger, to 20k no less, won't get you there. More important is what sounds right to your ears, room and works with your music preferences and current electronics. There is no simple right answer. As with all speakers, better electronics will yield better and more satisying results. Vandies are most forgiving but capable of true high fidelity sound that produce music at a very high level the more attention paid to realize their potential.   

@twoleftears ,
Yes, I forgot about ProAc. Very nice speakers with that British sound.
B

I think in the PBN speakers you will get exceptional sound. You will also get exceptional customer service.
https://libertyaudio.com/service/x-vox-loudspeaker-system/