The one set recommended to me (Labtec LVA 7330) appears to have been discontinued, and will therefore likely be difficult to find. It was recommended because it is a mic-only headset. The locally available choices seem to be full headsets, which I don't want, or monaural headsets, which I can probably live with.
I also have a choice between a mic connecting to sound card jack (SB Live), or one connecting to USB. Any advantage of USB over the sound card connection? With the USB connection it would be shared with another device (my CH Pro Throttle I think), so I'm not sure if there is a potential problem with that.