I have experience with just two, but here you are:

a) Cardo Scala 500 from about a year ago. Clients kept asking me why I sounded so muffled and scratchy on the phone, so I quit using that one about two weeks after I got it. This unit may have had Bluetooth 1.0. Don't remember. The charger was also stupid (I bent the little charging wires) and the device didn't hang on my ear very well. At the time I think this one was $55 or so from AMZN.

b) Plantronics Discovery 510. Seems like a pretty good unit after less than a week of use. Comfortable and clear. No complaints from callees. This one was about $45, also from AMZN.