The only headsets "worth the money" so to speak, are Sennheiser PC360's for $206.00 or the Beyerdynamic MMX 330's which cost about 350 dollars depending on your retailer.
Both of these headsets are modeled after regular headphones however, that can be had for substantially less (the Beyerdynamic equivalent of their headset is a $280 pair of their headphones).
The reason I put "worth the money" in quotations is because really no headset is worth the gaming designation markup that they all suffer. This applies even to brands and models as lowly as razer or steelseries. Gaming headsets are essentially 50-60 dollar headphones with a basic boom microphone attached, and then the price marked up by anywhere from 50% to 100%. In other words, it's a scamjob.
If you want to get the best inbound and outbound quality for your money, buy a pair of notable headphones, and a simple 9 dollar clip-on microphone from Zalman (this mic is literally the same quality as any boom mic).
Such headphones include:
Audio Technica AD700 - $105.00 (these were last year's model and were originally 250 dollar headphones) can be bought at amazon. don't let the price fool you they are arguably the best headphones for positional accuracy when combined with a dolby headphone/cmss-3d surround soundcard.
Beyerdynamic DT770 Pro 80 - $155.00 on amazon
AKG K701 - $275.00 Anything beyond the price point is beyond reason.
This is a good link with some quality reading for you on the subject:
http://www.head-fi.org/t/534479/mad-lust-envys-headphone-gaming-guide-updated-4-12-2012-akg-q701-added
edit: In the interest of full disclosure, I own a pair of AD700's and they are both the most comfortable and the best sounding headphones I have ever used. I use them with a basic X-fi titanium soundcard that can be purchased for 60 dollars. Other headsets I have either borrowed or owned (from recent years) are generic Logitech 30 dollar headset (varies in design by year - owned several pairs), Turtle Beach X12's, Logitech G35's, Tritton AX Pro's (this was the worst headset I have ever used bar none), Sennheiser PC360's, Beyerdynamic DT770, Beyerdynamic DT 880's with headphone amp, Astro A40's with and without mixamp, and Grados SR80i's.