Audiovox SMT 5600 / SPV C500 (HTC Typhoon)

I use three different headsets with the SMT5600. I have one for at work (Motorola 820), one while in my vehicle (Motorola H700) which I just got today and haven't used it yet, and one that I swear by the (Motorola 850) for when I am at home in my office. They are all good headsets, I recommend the 850 or try the Motorola H500 it is a bit cheaper and the upgrade to the Motorola 820. I hope this helps.