Quote: "If you don't want to pay an arm and a leg, you will get an inferior quality headset (Microphone quality and sound quality)."
Not true, bought a 5 dollar walmart mic that is the best ever invented. I demo'd it to my brother and a friend in l4d, and they've both since bought one.
It's this one, i've never had a better mic:
http://www.newegg.com/Product/Product.aspx?Item=N82E16836150075&cm_re=microphone-_-36-150-075-_-Product
Actually, it's not all that cheap, about 7 dollars shipping for 16 bucks total, it's worth it though, I'd pay 50 bucks for a mic this good.
I found mine at walmart about a year or two back for 5 bucks, so you might find it locally.
I use it clipped to my collar, and it picks me up loud and clear.