iGrado.
Grado headphones are well known amongst audiophiles for their quality, and price. Recently, my "work/gym" headphones busted, so I was in the market for a new pair.
Because my hearing is fucked, I can't wear earbuds, which suck for the gym anyway.
I discovered these iGrado headphones, and, for $49, decided to take a chance.
I was utterly astonished at how good they sounded. Not only were they loud, but they literally defined all the nuances of music that typically get lost in cheap headphones. For example, I can hear snare resonation in kick hits on miced kits. Also, their vented diaphragm design allows just enough of your environment's sound to creep in. Unfortunately, they're not designed to fold up, which to my mind is a major oversight. But, the wraparound headband does seem to be made of a strong, yet flexible plastic. There is enough tension in the band so that the phones hug securely to your ears. They're still no V700's, but they're absolutely recommended for any sort of non-production use.