There are some issues with computer based music servers... the computer needs to be optimized and should be used only for audio for best results. Usually a custom or stripped-down OS would be needed. Then you have the USB or S/PDIF issues and cables to deal with, neither are really ideal for audio imo.
I ended up going with the Sony HAP-Z1ES. No computer, no digital cables, great SQ. It's not without it's own set of issues but for me the tradeoffs were worth it.