With respect to "sound", I wish there were more nicely polished "streamer only" which only have digital out and without a semi-limited DSP.
Yes, it can be done with a small form factor PC. But I would be interested in a Gen 2 at half the price without analog out.
If it also integrated the functionality of a Shield Pro or AppleTV, then that would seriously rock.
Basically all conceivable content in a single slick box.