Bluetooth Headsets

I should be receiving my first bluetooth phone any day now. (Audiovox
SMT5600, purchased from Ebay, will use on T-Mobile USA.)

So, I'll probably get a bluetooth headset one of these days.

I see there are a lot of models now. The prices are a lot lower than they
used to be. (I recall they used to sell for over $100, I've seen some now
for $35-40.

But--I have no idea about the comparative quality of these headsets. I guess
some factors are reception, transmission, sound quality, comfort,
reliability, durability, etc.

Could anyone point me to any comparative reviews of current models on the
web? Also of course, if any reader would like to review the model they use
for us, that would be of interest as well.

Thank you for your input.