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

Empirically proven to be my Polk Audio SDA SRS2 set I bought new in the 80's.  I've had them longer than my wife of 35 years and every place we've lived needs to accommodate their considerable size and heft.  They are still the speakers for my solid state setup and are augmented with a Polk Center and Surround setup for AV use.  They are very musical, reasonably transparent, and capable of full range volume levels that make your chest resonate (Helicopter Rescue scene in The Matrix...  holy hell!).  

Frank

Yes there like my kids I don't want to get rid of any of them.my favorite old classic is the refreshed infinity irs v ,just stunning. Then the new era the tekton ulfbrich with all be tweeters rival my focal grand utopia at 1/10 th the cost. They tekton have a 30 day trial. I also have the review pair of moab with all be.fantastic for the $. Enjoy the music and the dopamine.

As I've mentioned a few times on various sites, I owned Duntech Princess for 19 years.  I reluctantly sold them for a pending move and downsizing.  They were 6' tall and weighted 180 lbs. each.  It took awhile to find the proper amps, but then they were the most musically revealing while emotionally satisfying speakers I've owned over decades in this hobby.  

Duntechs are made in Australia so shipping made them more expensive because of size and weight.  For that reason John Dunlavy moved back to the US and opened Dunlavy Audio Labs (DAL) which included several similar models.  They were also highly reviewed and I felt also great speakers.  But I believe the Duntechs had a couple of advantages.  DAL has been out of business for a few years but appear on used sites from time to time.

Now I would agree with @tom899 about the SP888.  That is a musical, well balanced design in a reasonably sized (footprint) package.  I've owned them about a year and have no urge to change again.

I miss my Dunlavy SC-III.

I’ll probably keep my Spica TC-50 forever. They share a lot in common with the Dunlavy but are not as physically imposing.

Absolutely love my Sonner Legato Unum's with Sonnor Stands. Have had them for 5 years. No matter what amplification I swap in or out the sound fantastic. 

I have in my system in our game room a pair of Raven Audio CeLest towers and they are a wonderful speaker I love stand mounts 2 ways and bought the CeLest on a lark after hearing them at the AXPONA in 2019 @ $4000.00 it was a deal, now they are $6K. 

Wont be swapping any of them out....