We just purchased our suburban yesterday. We are wanting to add NAV, Bluetooth and back up camera. Not sure where to begin as far as making sure we are getting the right stuff. We do have the Bose system which we have heard is not compatible with certain units. Is there a way we can buy all of these things together.. how do we make sure the Navigation unit we choose will support Bluetooth as well as the back up camera. We would prefer to purchase OEM unit.