if you stay within the VW camp for radio's IE RNS510 + Bluetooth add-on etc. It has no RCA out at all, you will have to run a LOC (line our converter) or an Amp with music detection on speaker level input.
Otherwise I believe Pioneer and Kenwood have just made VW replacement radios, takes up the whole slot for radio, in addition has all the features you are after.
Around the £700 - £999 range I believe.