Looking to add bluetooth - help?

Hi, Guys -

Relatively new here, bought my first BMW about a month ago - 2005 325xi, titanium silver, 108,000 - all maintence up to date at BMW dealer, assuming it had CPO coverage up until 100,000.

I've read and searched and saw parrot mentioned, but didn't quite understand, then I stumbled across this unit - my assumptions are that I can easily plug it into my receiver in the trunk (navigation head unit) and from there can attach the bluetooth dongle, and also run a USB cable to charge my android.

- Will I have full functionality of the head until \ wheel controls for calls?

- Thinking I can also use the other connection port to add sirius?

Any thoughts, suggestions, comments on this particular unit? Seems like a good price, USB \ Bluetooth for under $200.00?

http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40

http://stores.ebay.com/Grom-Audio-Di...=p4634.c0.m322

***assuming the factory mic above my mirror won't work - hoping I can run this one and use the existing location, I'm pretty set on keeping the stock look \ feel.

Haven't been able to find the cd changer connection cable in the trunk either, thought all these models came pre wired.

Appreciate any help in advance!

Buy the Parrot, it's tried and true. There are extensive DIY instructions on how to install it.