I've posted this before. If you really want the best:
Get this, everything else is just a toy in comparison...
MMX 300 MANUFAKTUR - Gaming & Multimedia - Headphones & Headsets - Headphones & Headsets Amazon.com: Beyerdynamic MMX 300 PC Gaming Premium Digital Headset with Microphone: Electronics
Yes they are very expensive, but totally worth it. It comes with it's own USB soundcard. The mic is simply amazing.
Good luck!