Can I get some advise on building a decent Bluetooth Car Kit?

[AC Question]

Bluetooth Car Kit

I have given up on Bluetooth Speakers and other forms of this. I wanted to know if anyone could give me advice on building a decent Bluetooth system in my car with a high quality microphone that I can mount, a Bluetooth base system that connects to my phone and can take the inputs of the mic and outputs to car speaker AUX. The easiest choice would be to have it professionally installed but this is my work vehicle so that is not an option.

Thanks,
Vince