^This.Zalman Clip-on Mic is the way to go, no matter what headphones you get.
As for the cans themselves, Beyerdynamic DT770s (~$200), Sennheiser 555s (~$105) and 595s (~$185), and Audio Technica AD700s (~$90) all tend to get lots of positive recommendations around here.
If you want to go cheap, I can't recommend the JVC HA-RX700's ($34) enough. If the sky is truly the limit, Sennheiser 650s (~$400) and a nice headphone amp would be fun!
If I were to go with the Beyerdynamic DT770s or any of the high end ones you suggested would my Creative Labs Sound Blaster Xfi Titanium Fatality Champ (NCIX Link To Soundcard) sound card handle those beasts (specifically the Beyerdynamics: NCIX Link)? If not do you have any amp suggestions? I'm looking for the sharpest sound in gaming, though aside from sharpness great quality would also be nice.
Whatever you do, please don't buy into this: http://www.psykoaudio.com/Funny, I was actually looking into those as a viable option. What makes you say that, I wonder?
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