Easiest way to get quality bluetooth audio?

I have been looking into various solutions for playing music from my iPhone. I am not sure exactly what I want, but I know that I don't want to spend a ridiculous amount of money on it. I also want to maximize sound quality (no FM transmitters). I know that I will probably have to choose between the two. What are my options?

Here's some information; I'm not sure what's applicable. It's an '06 530i. I have the business professional radio, with hifi speakers. I have the in-dash cd changer, capable of reading mp3s, as well as the 5-disc changer in the glovebox. I don't have an aux input installed.

Is there any product that I can use to replace the glovebox cd changer, where I can use A2DP/bluetooth to stream audio (like a Jambox or Bose Soundlink)? I have bluetooth, but it only works for phone calls. Since I already have the CD changer in the glovebox, do I still need a professional to set up the fiber-optic connection?

Sorry for the overload of questions. Thanks.