The one I use the MOST is the Motorola S705 BT pendant, which lets me plug in ANY stereo headphone I want, so I can use my Livewires, or PX100, or Grados, etc... With my Verizon "I spend a lot with them" discount, it was under $75. It has a microphone for phone calls, and includes an Fm radio to listen to! I can find not fault with this device.
The Jabra BT620 mentioned above actually sound fairly decent, look better on the head than Moto HT820 (and sound better), and can be used for music and phone calls too. My only complaint about them is they are easy to accidentally turn on and then when you need them the battery is dead. The press and hold left earpiece center button to turn on is just too short, and if they are in a fanny pack, or briefcase then things rubbing up against them turn them on.
The sound on the Jabra BT8010 is nothing to write home about. The Moto S9 look good, and sound is decent too, but they are still over $100.
My Creative SE2300 sound good, but are stereo music only and no phone calls allowed. Their included transmitter doesn't have a lot of gain, but you can hook the transmitter up to a headphone amp output, and then the headphones sound great.
There you go!