Nowadays if you are going to invest in a serious pair of headphones (and well why wouldn't you?) I understand that there are headphone amps available to deliver a better sound quality than if you plug the headies straight into the back of the soundcard. Now my question is this: Are headphone amps made to be standalone amps for the headphones (IE you dont need to connect them up to your existing amp/soundsystem) or do you need a seperate amp to connect them to? Soundcard -> Headphone Amp -> Headphones or Soundcard -> Headphone Amp ->Amp/Headphones The reason I ask is.... Surely if you have an amp, why would you want a seperate one purely for headphones if there's already a headphone socket on your existing one? I am looking to invest in a decent pair of headies soon and wouldl like to know just how much I will need to spend if I have to include the purchase of a headphone amp on top.