When you consider purchasing a gaming headset, it's important to decide whether you prefer a closed-ear or open-ear design.
In general, closed ear designs cup closer to the ear and block out more noise (and arguably better bass), although some users find the open ear designs, which allow more air flow, to be more comfortable.
So, in summary:
Plantronics Closed-Ear Headsets: Gamecom 367
Plantronics Open-Ear Headsets: Gamecom 377