Best EXTERNAL DAC suggestions

Yes, I have the latest addition to the Bluesound node, I guess third generation, prior to the most recent anniversary X addition. I know they have improved the inner DACS with each version but now I’m asking what would be some thing better in your opinion and one that is in the ballpark.

I have Cornwall Heritage IV speakers, and I am currently running a NAD C 316BEE amp( which pairs well with Klipsch 102 db) at 40 WPC. In the winter my Mancave is heated by a tube Cary SLI-80, UL /Triode 4/8 OHMS. 
either way, I love the ability of the Bluesound node to be my preamp and facilitating my Apple Airplay 2 and the eArc into the TV/CD. Mancave is treated, speakers and me complete a 6’ triangle.