Oh, one word of warning if you decide to go get the HD570s: be prepared to re-rip or re-obtain any mp3 you have that's 128kbps or less. The sound reproduction is so tight that you'll hear every annoying glitch and artifact in the mp3 encode. 160kbps/192kbps for mp3, or level 5 and up for OGG.
One of those unintended side-effects when bumping up a level of quality I guess.
