For streaming audio, I'd think a used, tube-modified ModWright Transporter would run circles around the Zardoz. Logitech's server software is quite good, as are its smartphone and tablet apps. It's an ease-of-use/ease-of-setup winner IMO. Of course, Slim/Logitech no longer makes them, and you'd be limited to 24/96 - but still, for streaming audio (or any audio) it's pretty freaking spectacular, and it's very easy to setup & use. You can also use it as a DAC. New products to look at (I just did a bunch of research in this area, so...):
PSAudio PerfectWave Mk.II w/Bridge
Linn Akurate DS
Naim NDX
Problem is, all of these leverage UPnP - and IMO none have done it really well. If you were to go down that road, I'd say just be sure of the dealer support/return policy, as your mileage may vary. I wound up keeping my Transporter after some frustration with UPnP implementations.