HRT Music Streamer II or Cambridge Audio DAC Magic??

I want to start using my laptop as my primary source in my existing hi fi.

I was planning to use an HRT Music Streamer to take care of the converting but wondered whether I would be better off spending the extra ton and get the DAC magic and run my other sources through this too.

I have a Rotel RA-02 amp, NAD C 521 BEE CD player and Denon TU-1800DAB tuner.

Would an outboard DAC really improve on the in-built DACs ??

 Any suggestions and advice would be gratefully received.