I've listened carefully to many closed headphones in my home, listening for excellent insulation from outside noise plus great sound.
Some: Sennheiser 280, Sennheiser 380, Sennheiser HD 25 1 II, Ultrasone 780, Audio Technica 900, Audio Technica ATH-M50,
Audio Technica ATH-ES7, Shure 840, Shure 940, Beyerdynamic 770, Denon 2000, Sony 7506, Sony 7509HD.
Of these, I highly recommend the ATH-M50, Shure 840, and HD 25 1 II.
The HD 25 1 II is quite amazing. Small, light, sturdy with great sound
Super easy to travel with and very good isolation.
Comfortable to wear for long periods of time.
Also: they stay on your head even when you're lying down.
That might seem inconsequential, but I've found in reality it's quite important since
I'll often be reclining or even lying down on my back while wearing headphones.
My other choices are the ATH-M50 and Shure 840.
But the 840 look quite ridiculous.
You'd need thick skin to be seen wearing them in public,
or even to look in a mirror with them on.
The SQ and isolation are excellent, however, as has been widely noted.
The ATH-M50 don't look quite as odd as the 840's. SQ is very close to that of the Shure,
and isolation is about the same or better. They also have a nicer build quality.
But neither of them will stay on your head if you choose to lie down.
If that's not an issue, I'd do my best to get to listen to those three phones:
the HD 25 1 II, ATH-M50, and Shure 840, so I could make an informed choice.
If I simply had to recommend one, I'd opt for the ATH-M50.
Very well made with excellent SQ and isolation.
And, importantly, a very quick & easy resale if you don't like them.
2nd choice would be the HD 25 1 II.
The quality of sound that comes out of those little guys is startling.
Again, very well made.
And you can wear them while lying down.
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IMO, IMHO, "in my view", etc., are
included wherever appropriate.