Budget External DAC Recommendations

I just upgraded my Audioengine B1 Bluethooth receiver (using iTunes) to a Bluesound Node 2i (streaming Tidal Hifi) and the increase in sound quality is shocking.  It has me wondering if I can make another incremental increase in SQ by purchasing an external DAC.  Will a $400 - $500 DAC substantially best the DAC in the Bluesound Node 2i?

I am looking at the used market and have narrowed my choices down to (in no particular order):

- Chord Mojo
- Benchmark DAC-1
- PS Audio Digital Link III
- Denafrips Ares II

Which is the best? What else should I be considering? Also, for those who have heard the Node 2i's DAC, how does the DAC you recommend change the sound quality?

My system includes the Node 2i, Rogue Cronus Magnum and Totem Hawk speakers.

Thanks for any suggestions!