Best aftermarket head unit

[Aggi]

I’ve been messing for ages trying to get decent audio to my B7 RS4 (avant… irrelevant) tried aux wired (head unit code couldn’t be set) Audi AMI Bluetooth (the version in the b7 isn’t supported) fm transmitter (obviously low quality)  Bluetooth receiver on the iPod dock (didn’t) work….. so I’ve got to the conclusion that an aftermarket head is the only solution for decent  quality. Don’t want to go nuts (£500) and don’t want to have to change the cabling (I’m an ‘as factory’ nut)…. Help!!