Given the fact that there are only a few people who actually listened to JVC HA-S600 or KOSS UR55 (opinions about these still highly appreciated), I decided to consider other possibilities again. For music I usually use my smartphone (Desire HD), I listen mainly to electro music, mostly dubstep, sometimes techno. Good strong bass is number one priority, although I don't want to sacrifice clarity and overall sound "cleanliness" (it's okay to some degree, but not too far), that's why I don't quite consider buying MDR-XB500's. I'am looking for best bang for the buck, but don't count on Amazon price drops as I will be buying them from my local shops (+/- regular prices), to give you the better idea of pricing, S600's costs there ~44$, UR55 ~50$, senn HD439 ~95$, PS. By saying portable I don't mean that they should be foldable, but they can't be much bigger than S600.