adding DAB to W204 2011 C Class

[C350 Carl]

Evening all.

I would like to add DAB to my Comand NTG4 system in the car.

I know there is a genuine Mercedes retrofit but at circa £1200 I think the wife would castrate me.

So I was wondering if anyone has any recommendations on which are the best DAB aftermarket adaptors to buy. The only caveat I have is that it must be invisible once fitted and display the information on the comand screen.

Also my car has Bluetooth which my phone connects to. However as I get limited functionality I was wondering if the Viseo adaptors would give me anything more apart from not having to use VCF 's to import contacts?

Thanks in advance.

Carl.