I have tried multiple wired headsets and the HS820 Moto Bluetooth ear piece for my Blackberry.  They have all been either not loud enough or in the case of the HS820, bad sound quality.  I decided to try the HF820 and it works really well.  The volume is quiet good and the noise cancellation seems be quiet good as well as people I spoke to during my drive on the highway in my car, with windows up, didn't notice I was on the speaker unit.