I currently have the Razer Megalodons but I received for $90 shipped and that is about what I think they are worth. Can sound hollow at times but overall I really like the headset. Razer also came out with a true 7.1 headset that is supposed to sound pretty well as they hired veteran audio engineers apparently to build them. My next headset will most likely be a Astro A40s or the Sennheiser I have linked which I have both used extensively and think they sound wonderful. If the A40's are too expensive the Sennheisers will be as well so you may want to look into the A30's which are cheaper and smaller but still offer great audio.
I'm thinking of either going stereo with something new like the Ear Force X12 (Turtle Beach) or just going all in with the PC 360 (would need to buy a sound card with this one). If you have to go wireless I think G930 is a good option. My neighbor has them and swears by them.
Turtle Beach products sound great and are really reasonably priced while Astro and Sennheiser are more expensive but will provide a much better listening experience.