Hi guys, I guess this question has been asked a million times. But it isn't in the FAQ so I am going to ask again Which head unit is the best OEM upgrade to go with on an 8P2 with Symphony as standard? I would like intergrated phone, some sort of line in or media playback facility which will work with Spotify and that's about it. I have seen RNS and BNS, I know one is newer and more sophisticated but as I believe RNS needs a separate Bluetooth module and BNS is all inclusive in the unit? Is this correct. Thanks.