Add Bluetooth handfree to RNS-E or Replace

[djt100]

Hi All, I have a 2006 A4 Cab with the RNSE head unit in, no handsfree from the factory, so looking to add this and music streaming if possible. 

 

Anyone have any recommendations at all, or am i better replacing the whole head unit. I'm not bother by the nav as use google maps always anyway. just looking to be able to make and take calls, stream music and in an ideal world add usb playback, but that's not essential