If your goal is sound quality with server driven audio, then Jitter is the #1 thing to reduce. The #2 thing is to eliminate or minimize the effect of the digital filter in the DAC. This is what wins best of shows and Golden Ear awards. This is why the new Meridian MQA technology is interesting. This is why so many use NOS DACs with older D/A chips in them.
The #3 thing to optimize is the server software, which means the player S/W, CODECs, power supply, OS and background tasks etc.. One product that optimizes all of this for you is the Antipodes server from New Zealand. I would not hesitate to use one at a trade show and I have. The Sony HAP series is very good, but beaten handily by the Antipodes.
If you dont care about SQ, then ignore these and buy the $250 DAC and the $500 server.
If your budget is $2K, then just get the Sony top of line HAP.
Steve N.
Empirical Audio