Plantronics Discovery 655 is the unit I'm using. When I bought it several months ago it was rated #1. Now there are several others, with a slightly higher rating like Aliph.
But the Aliph units are all over the ear. I personally like the in the ear headsets and the 655 is the best of the lot. I also comes with an over the ear loop for those that want that. This unit sits in your ear and doesn't move around or come out. Clarity is superb.
I like the options is comes with.
, the Discovery 655 comes with a selection of charging options. With the first option, you slip the headset into a carrying case, which then connects to the wall charger. Though you must use the carrying case for the wall charger, it's very small and it even has a little clip on the back to attach to your shirt pocket. Also, if the headset is in the case when a call is received, it will vibrate, letting you know there's an incoming call. When you take the headset out of the case, it will automatically answer the call without you having to reach for your cell phone as well. We found this to be an especially useful feature when your cell phone isn't as easily accessible, such as if it's in your pocket or backpack.
There are also other charging options made specifically for those constantly on the go. There is a small tube that can be attached to both the carrying case and an included USB cable, so you can easily charge your headset with your computer. Finally, there's an ingenious cylindrical charger that you can insert a AAA battery in, attach it to the carrying case, and charge your headset without the need for a wall charger. The Discovery 655 even comes with the AAA battery included in the package but I found mine to be dead.
I am happy with it. The little thing is amazing. I ordered mine on-line at Newegg, which had the lowest price, $80 shipped.
CNET review
http://reviews.cnet.com/Plantronic_...dset/4505-12523_7-32030123.html?tag=pdtl-list
Newegg"
http://www.newegg.com/Product/Produ...0&Description=plantronics+655+headset&x=0&y=0