i'm using S9 from Moto. Sounds great, I picked mine up at Verizon for about 99. Its worth it though. My storm use to play movie audio through the headset too but its not now. not sure its from an one of the updates or not, but music sounds great, even using Slacker.
I'm looking for one too. I want something similar to the Jabra BT 8040, I don't want the Jabra as my wife has one. She is happy with it, but I don't want the same one to avoid confusion. I like the looks of the Blueant Z9i, but not sure if it works the same as the Jabra.
I was looking for a Bluetooth that would play audio and I did not want the big headphones. I found the Plantronics Voyager 855 and I just love it. You can use it mono or stereo, on long car rides or when I am cooking I use both ear pieces but for everyday use I just go with Mono. The ear pieces are by far the most comfortable I have ever used (I have had a Motorola and BlueAnt Z29). I highly recommend this product. The cheapest price is on Amazon...sorry Crackberry.
Good Luck!