Well I have been trawling posts, trying on everything I can looking for a portable on or over ear. I have been suffering from repeat ear infections despite scrupulous cleaning from iems, so I needed a solution.
I use HD-800 at home, and AKG K-550 at work, but both are a little large. The momentums seemed a good fit, but unfortunately they have gone the commercial route and overblown the bass a bit. Not as much as beats but enough to make the timing wooly. Timing is crucial for my music so that was disappointing as I respect Sennhieser. I was given a pair of B&W P5 (lucky me) but they are just bland: lack of resolution, rolled off and bloated. Not as bad as beats, but not good for the money.
I got a chance to listen to the P7, well run in. Much better than the P5s, with resolution and air. However who thought the great big bass punch exaggeration was a good idea? Sure it's impressive, but it ruins and otherwise potentially musical performance. Once again B&W loses sight of John Bowers' original vision. Something they lost along the way.
B&O H6 are nice. Nice is not good enough, as they are a little uninvolving, but pretty good. A bit dull.
KEF M500 get the vote from me, as they are quite involving and fun. Not fully neutral, but not doing all that attention seeking exaggerated bass. However as I like the AKG K-550, the 545 look very intriguing, and I haven't heard the NADs yet.
They is very much a flavour of the month thing here on head-fi, but with all the analysis, sometimes the music can be lost. Use a recording of questionable quality with a great performance when confirming you choice. You may be surprised by the winner.