DAB Ipod Dock

Hi there,

I would like to buy a DAB Ipod dock.  The plan is to plug it into the auxiliary on my amplifier and then I will be able to run that through my stereo and nice big speakers. 

At the moment I have got a cheap Dixons DAB tuner plugged into the amp (a Sony TAFE370S) and it sounds perfectly fine.

 As the speakers will be redundant on the ipod dock, is it worth buying an expensive one or can I get away with a cheaper one?  Any recommendations?

Thanks,