What speaker is the most musical, one you never want to sell?

@mark200mph 

Are you a member of the CAS in Colorado ? 

Harbeth C7ES-XD.

Other brands I’ve owned since 1970

Dynaco, B&W, Theil, Quad, ADS, KEF, and ATC. 
Nothing meets my expectations like this Harbeth. Unlike every other speaker I have owned I find nothing to dislike. A joy to listen to every day. I will always own Harbeth. If I had a larger room I might go for the Harbeth M40. 

Klipsch Heresy IIs circa 1985 with new Crites caps powered by Dennis Had Inspire KT-88 & St Pete EL34s.  Sweet, dimensional, non-fatiguing musical presentation that will be with me to the end.

magnepan (3.7 and 1.7)

proac (response 3.5, 1.5 and d30r)

quad esl63 

spendor bc1/sp1

all with rel subs

(harbeths, klipsches, wilson's, horns, vandys, b&w's, totems, focals, sonus faber's all have come and gone over the years)

@crn3371 +1 on Merlins Black Magic with reference Zoebel caps.  Shared my setting up those in a recent system and they sing.  Non-ported design works so well in less than perfect acoustic environments.  Easy enough to drive and not harsh of non-esoteric upstream source / amplification.  They are just wonderful.  System exceeded all expectations in a modest room.

Currently for 4 years ATC SCM 50 ASLT active.  On the way ATC SCM50SE with upgraded internal amplification.  So then we are done.  Any larger / heavier, no thank you.