I use a Sony HAPZ1ES in both my systems. The interface is great, iPhone or iPad app always works and it plays all the formats. The built in dac is excellent. It got awards from both Stereophile and TAS plus others. I see them here used for around 1200-1400.00.
I wish the Mac server worked like all the other Mac products as I would have one in my system. I was told to stay away.