It seems like you have found your own solution out there. And I'm sure it was a much cheaper solution. Just wanted to mention that HTC has a Bluetooth Audio accessory for assisting with wireless music transmission.
HTC Bluetooth StereoClip Overview - HTC Accessories
I haven't used it so I cannot comment on its use. I do know that the cost is somewhat high to purchase it and you could probably find a cheaper solution. Just wanted to throw it out there as an idea for you or anyone else that may come along