Bluetooth options with stock unit.

[Yoop33]

I have the stock Navi with rear DVD in my '08 Limited and need the best Bluetooth option I can get. I would like something that can be completely hidden but would still be able to use the stock steering wheel controls to change tracks, volume, etc. I would also like to connect two devices at the same time if possible. Does anyone have experience with this and what are your suggestions?

I'm NOT looking for some Parrot display that shows me contacts or who is calling or some obnoxious thing I have to mount in view...