I recommend 2 headsets which have a very reasonable price and excellent quality.
1. Plantronics Gamecom 380
2. Logitech G330
Both of these headsets have excellent mic quality but the Logitech G330 is lacking in sound/speaker quality compared to the Plantronics Gamecom 380 (which has a very high volume).
Now here is the tricky part. If your PC doesn't have a dedicated sound card, then I would buy the Logitech G330 as it comes with a USB adapter with an inbuilt soundcard of it's own, and it truly is like night and day compared to using 3.5mm jacks in an onboard soundcard. OR you could buy a universal USB headset adapter for about 5-10euros and use it with the Plantronics Gamecom 380.
Overall I recommend using the Plantronics Gamecom 380, but just remember to buy a USB adapter if you don't have a dedicated soundcard.
And lastly, I would try and grab a little foam filter thing that usually comes part of headsets as neither of the above headsets have one and they help with background noice and mic blowing. Not that much of a big deal though.