Budget: Under $150   I want something that leaks the least possible amount of sound because I'm mostly going to use these headphones in library environments. Sound isolation would also be nice. I'm only using a laptop (no amplifier, external sound card, etc) or iPhone to drive these, so I...

thanks for the recommendations so far. i looked at some other phones, would the dt770/dt880 be any good for my needs? and if so, would a sound card like a auzentech forte/asus essence stx be able to power it without a dedicated desktop amp/

so.. i need an upgrade from my hd555 for around $250 usd use: gaming, movies, music: mostly female vocals, and closed preferably because people complain when they can hear what i'm listening to need something that's easy to drive, really don't want to get an amp (recommending a sound card...