I use the Nokia BH-200 and absolutely love it! I don't have any problems with background noise, static, etc.. and the calls are very clear. In addition, I prefer the soft rubber piece that slips between your ear lobes, as opposed to, anchoring over your ear. Check it out...very reasonably priced at $40 from BestBuy.
The one in my sig is the best I have ever used. I have been using it for about 7 months and have no problems at all. NEVER been able to say this before after having used over a dozen different headsets (all returned). Now looking for another for the wife so she'll stop borrowing mine!
I picked up my Nokia BH-900 about a week ago. It works great. Everyone says I sound clear and they sound nice and loud. The ear hook is a little tricky at first but I got used to it pretty quickly.
just watch out where you buy a headset from - there are a bunch of pacific rim knock-offs masquerading as the real deal. The motorola and samsung bluetooth headsets are particularly affected. If the price seems too good, chances are it is.
Motorola has a PDF document out describing ways to discern real from fake Motorola headsets, I don't have a link handy but a quick google search out to find it. Or go to Amazon and look up the H700 headset; the guide is shown there.
For the past week I've been using the Palm Treo bluetooth headset (rebadged Jabra) left over from my Treo 650, but ordered a Moto H700 as I prefer to be on one type of power connector if possible.