mikepaul, I have not done comparison between the Bluesound and my current source, the reviewed Small Green Computer SonicTransporter and the SONORE Signature Rendu SE with systemOptique. I am very pleased with the performance, both as server and streamer.
If you consider the Rendu, make sure you do the systemOptique option, which can be ordered built into the Signature Rendu. I was stunned by the benefit of transitioning from an ethernet connection to an optical connection into the Signature Rendu. (See my article on the systemOptique). It's an enormous improvement over ethernet connection.
As to DACs, I have used many. My experience is that it is almost impossible to recommend a DAC as universally superior, as every last one has done better/poorer with different combinations of gear. One of the most consistent in all systems has been the Exogal comet with Plus Power Supply. However, in some systems the COS D1 DAC+Pre has superseded it. Then again, the reverse is also true in particular systems. I have found no universal superiority with any DAC tested to date. I have most definitely found superiority of certain DACS in certain systems. Don't let anyone tell you that any given DAC can't be beat.
But, I wouldn't quickly return to the old Ethernet standard. Perhaps someday a standard Ethernet/DAC combo will impress, but that remains to be seen. COS D1 also reviewed for Dagogo.com