WiFi System Upgrades

What should I upgrade (if anything) in the following playback chain?

I use iTunes on a Mac Mini to play ripped CDs (Apple Lossless) via WiFi to an Apple TV3.

A Cambridge DacMagic does the D to A and it then goes into my regular analog system (Sonic Frontiers Line One pre-amp; Sunfire Cinema grand bi-amping the Maggie 1.5QR speakers - which are likely to become 1.7i soon).

I hear a lot about other players besides iTunes.
The DacMagic seems pretty good even today.
Or I could eliminate WiFi by buying another computer and moving this one into the room where the stereo system is, using some sort of cable to go directly into the DacMagic.

What would you change and why?