I agree with Jerry about the Topping, if you buy it and don't like it return it.
Nothing to loose, and you get to hear it in your own system.
I still have my Jolida FX Glass DAC MkI and find it very good. Tube rolling has been fun, Tung Sol in my system sounded a bit dull, Siemens, Telefunken, Harma 7025 Cryo, Sovtek Long Plates tried, but by far the best were some NOS 80's Chinese military valves, still in place.
Gary