Any idea which headphones I’d like?

Audio-Technica Corporation (Kabushiki Kaisha Ōdio Tekunika) may be a Japanese company that designs and manufactures professional microphones, headphones, turntables, phonographic magnetic cartridges, and other audio equipment. it had been established in 1962 in Shinjuku, Tokyo, Japan, by Hideo Matsushita as a phonograph cartridge manufacturer. In 1974, the corporate developed its first headphones, the AT-700 series. Interesting modern models include the audiophile ATH-AD series and professional ATH-M/R series.

Dynaudio has always been a high-end hi-fi brand - and it's not looking to give over any of that market any time soon.

@mastering92  sorry for the late reply.  Best wishes and good health to your mother. I hope you all get through that. 

All, thanks for the comments and input.  Tons of info and thoughts to pour over.  

@toddcowles I too have sold off all my two channel, loudspeaker stuff and have allocated all of funds towards my headphone system.
That system now consists of a Metrum Pavane L3 DAC, Luxman p750u headphone amp and HiFiman Arya ’phones.

I chose the Arya because I like the planar magnetic sound. Some people claim the Arya is bright but I’ve never experienced that. To me, they have a velvety smoothness in the midrange that I look for in a good headphone.
The bass has tremendous weight but it’s not the lightning fast, tight, accurate and very detailed bass of the 3 Focals I had here, ( Elear, Clear and Stellia).
Those headphones, especially the Stellia, did many things amazingly well. All three were undoubtedly the most dynamic and hard-hitting headphones I’ve ever had the pleasure of listening to. Sometimes I really, really like that. I almost felt it in my gut.

So anyway, it’s difficult for me to think what headphone would work best for you when you describe your loudspeakers. It would be easier for me to recommend a headphone with my very limited knowledge in this subject, to ask what it is exactly you want from your headphone.

If you like amazing speed and detail, lightning fast Dynamics, and hard-hitting sound, I would recommend something like the Focals. All of those characteristics get better the further up the line you go. However their  sound stage is slightly too small for me.

If you prefer a very buttery, velvety smoothness in midrange, nicely detailed highs exceptional base response with a wider soundstage, then I would go planar magnetic.
Something like HiFi man or Audeze.

What’s your budget?