I listened at many of the headphones on this thread.. Momentum, PSU, MDR-1R, beats (already own), plus a bunch of others I posted about. I got some second hand A900's (not the X) for $100. Comfort and sound quality it beats all of these, and is very very close to the LCD2 when I compare them side by side with a good FLAC/optical/DAC/amp system. The A900 aren't at all portable, not even slightly, but I'd love to hear MacedonianHero's comparison.