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I ordered the PXAMG, PGHGM1 harness, ISBT21 Bluetooth device, HD Radio tuner, and the iPod cable. I thought it had 3 ports, but it had 2 so I had to return the HD Radio tuner.
It does not use the factory mic, but you can do what I did and hide it and no one will ever know the difference. It works just like factory anyways.
Why don't you just use the GM ONSTAR LOCKPICK it works with Onstar and you can hook it up to any bluetooth kit to it? You can find it at http://www.coastaletech.com/onstar.htm