After a new round of reading and auditioning, I just added a pair of Sennheiser Momentum circumaural/over ear Headphones.
Ended up on these because:
1) I've always liked the whole Sennheiser line for many years. Had HD 424s years ago that I preferred over the other big names taht are still around.
2) I wanted something closed rather than open to keep the sound in especially in bed at night, reasonably portable, versatile and relatively easy to drive well that comes close to the best sounding open-back audiophile in-home headphones that most people might own, including my Stax, which are a totally different but high performing beast. I do tend to prefer open back phones in general. CLosed not open eliminated a lot of common audiophile choices.
3) Momentums sounded as good as anything I heard out there and many regard them as Sennheisers best "portable" phones + they are closed back.
Might add a portable headphone amp still. We'll see....
Audio Technica ESW9 on ear wood cup portables ($50 less than cost of the Momentums, which I acquired on amazon for a decent discount) were another very strong contender that I could live with.