If this is a double post, than I´m sorry!
For the last 5 years I´ve been using an Icemat Siberia headset that came with a usb sound card, although I don´t use the card, I have to say it was one of the best purchases I´ve made so far concerning headsets, the sound is great, it´s extremly confortable and best of all I use it to protect my ears from the cold while taking a walk, lol. I´m not sure if it´s true 5.1 or virtual .1, they sure sound like it, all I know is that they´re awsome.