Thanks for sharing your views in this. I'll check this out as well.I think USB input is not what its cracked up to be. DLNA servers like MinimServer stream music as well as USB would, and support cover-art, FLAC, DSD formats if your DAC/streamer supports. I use both on the CA 851N, and can not really make the difference out between the two.
While at it, I would recommend Cambridge Audio 851N. It's an excellent streamer and preamp. Handles all the formats I can throw at it, and has Spotify, Tidal, ApplePlay etc integrated.