I've been using M50s for the past year or so, but unfortunately they were stolen! So now I need a new pair of closed, over-ear headphones. I liked the M50s, but I think it's time for an upgrade.
What I liked about the M50s: comfortable, decent isolation, nice highs
What I disliked about the M50s: weak lows/bass, meh mids
I listen mostly to dance, house, trance, electro, dubstep, pop and hip hop (think Avicii, Deadmau5, Kanye West, Rihanna...). Driving the cans will be either my iPhone or my MacBook Pro (no upgraded soundcard, no amp). Most tracks I listen to will be .mp3 format in the 192kbps - 320kbps range. Also very important to me is isolation (the M50s were decent in this department, but the more iso the better): when I put these these on, I don't want to be able to hear anything else going on around me (I don't care about sound leakage, I care solely about keeping the outside sound out; even if I'm not playing music, I'd want the cans to block outside sound such as they were glorified earplugs, lol).
Looking for something under $200, though I'm flexible.