Just picked up this headset from CycleGear for $150:
http://www.cyclegear.com/eng/product/HBC100_Moto_Bluetooth_Communicator/web1010959
Installed it today and it works great. Very easy installation in my helmet, and it sounds very good. It has an automatic volume control, blue tooth connectivity to your smart phone (really cool with Siri), great battery life and best of all no boom mic!
People I've called say they can hear me very clearly and can't hear the bike or wind noise at all. As one guy put it - it sounds like I'm talking on speaker phone in a quiet room.
Probably not the best headset out there, but for $150, I think it's a pretty great item.
C