I am somewhat of an audiophile (sound engineer for various bands, musician, etc) and have really come to love a few different headphones for different reasons.<p>Right now I have a small array of headphones:<p>While mixing for bands I use AKG K171's<p>While walking around town, I use my AKG Q460's<p>At the gym I use Bose Triport In Ears (forget the model #)<p>At work (in the office) I use my Q460's, but plan to upgrade eventually to Audeze or Ultrasones.<p>At work (at home) I use my AKG Q701's.<p>There is a lot of variation in the sound, but my philosophy is this: 1) general listening, use any over-ear, closed-back phones that sound good with an iPod. 2) Mixing, you need something with great isolation, but never buy "noise-cancelling". 3) If you're alone and don't want to bother neighbors, a good pair of open-back cans will give you amazing sound and a ridiculous sound stage. 4) Gym, just something comfortable and decent sounding. 5) At the office, good sound, closed back for minimal bleed.<p>Keep in mind for many of the higher end cans you'll need a good amp and DAC to get the most out of them.