The Plantronics brand of PC headsets seems to be the least
expensive overall. In addition, the Plantronics GameCom 380, in
particular, has many great reviews.
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Are you asking when the game will come? The developers have said
that they're working on the game, so it will probably be released
in late October or early November like the other games in the
series.
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According to the gaming headset review at Bit Tech, their
reviewer rates Creative Sound Blaster Arena as the best, followed
by the Razer Cacharias. They rated Plantronics GameCom 377 in third
place overall.