I'm looking for headphones/headsets. I have a mic so don't need one on the headset. I currently have a Creative X-fi Fatal1ty Titanium soundcard with Logitech Z5500 speakers and a Speedlink Medusa 5.1 (first gen) headset. I'm willing to spend at most $300 for a good set of headphones and an amp if needed. Comfortable ones would be a big plus. Also somewhat easily available ones, as in not ordered from Europe. I looked at Turtle Beach Z6A, Astro A40, Sennheiser PC360, but don't really have a clue.