Hey all, Im looking for a standalone USB or IPod DAC in the $100-$300 range that will improve the sound quality of my IPod or laptop. I want my Bottlehead Crack amp to take care of the amplifying and the DAC to just improve the musical quality. I'm still not convinced that a DAC will make a...

Hey all,   I'm looking for headphones that are as good as my HD600s but with a different sound signature. I'm willing to spend up to $350 and I would prefer portable headphones that dont require an amp. I have a Bottlehead Crack Tube Amp that works perfectly with the HD600s but supposedly is...