ATH-AD700 one of the most highly recommended low priced "Audiophile" headphones. I have this pair http://www.amazon.com/Technica-ATH-AD700-Open-air-Audiophile-Headphones/dp/B000CMS0XU/ref=sr_1_1?ie=UTF8&qid=1351262929&sr=8-1&keywords=ATH-Ad700
Not too happy about the color but so much cheaper then the rest. I just bought a zalman mic to go with it for gaming. Can't even feel these things on your head with the wings that hold them up.
They are also known for having pretty good sound staging for fps games
Edit: I also own a asus xonar DG card, sounds good.
Also these are not made to supress outside sounds or suppress sounds coming from the headset itself. With the xonar DG I could max out the volume and use them like speakers in my room lol. Any gaming headset you look at are trash in comparison to a good pair of headphones w/o a mic.