I have (2) that I use that work GREAT. The best two I have ever used...
BlueAnt Micro X3 - Handsfree profile. I use for day-to-day calls and lounging around the house. On Fleabay for much cheaper. Small, lightweight and come with MANY accessories. Very well developed and equipped and loud & crisp.
http://www.blueant.com.au/X3_micro_B...th_Headset.htm
Jabra BT8010 - Handsfree & Stereo profiles. I use this for phone calls plus stereo sound. Has a LCD for caller ID, vibrate plus has detacheable component for stereo sound. Comes with USB charger, downloadable software for firmware updates, phonebook, etc and carry pouch. INCREDIBLE sound too! Loud, crisp and hangs around the neck when not using. I use this one alot.
http://www.jabra.com/Sites/Jabra/NA-...braBT8010.aspx
Read the Cnet reviews on both for more info.
I have also owned the Blueant V12 (great headset) & Motorola H300 (Good headset)