My 'reference' for good headphones are my HD650s with a music streamer ii+ and a Fii0 E9 amp (not amazing, but the best I've ever heard). I'm looking at the Senn HD-25-1-ii, the DT 1350, and the Vmoda M-80s as good, closed, headphones mostly for the gym.
I'd go with IEMs, but I've realized that I hate IEMs.
So I guess I'm looking for someone with more experience to help me decide which of these portables would best suit my favored sound. My only issues with the HD650s is that, yeah, there's a little scooped off the treble and it 'de-energizes' some of the music that I find 'trashier' and just more powerful at the gym. At the same time, I don't want my ears to bleed from the treble. For a reference, I find Grado's much better for energetic rock, but also VERY, VERY fatiguing. I don't have much experience with other brands except the UE10s - and I find them generally disappointing.