any one of these:
http://www.sennheisercommunications....T05_Pro-Gaming
i use the pc150's and they're great. nice sound quality and in-line volume/mute. sennheiser > *. only 50 us for the pc150's. not sure about the others there, when i bought this it was the 150's or the 165 i think. the 165's were the same thing just usb instead of standard mic/headphone plug and added another 50 bucks to the price
just read a bit about about the 160 series. if they arnt really expensive, i'd consider getting those. they have a bigger ear cup and probably have better surround sound. if you play fps' that'd be a huge plus. the 150's do, but i think the 160s are better at it. or so the site says, lol