I think one you should consider at the same price is the Gustard R30. It’s an R2R DAC and has gotten some very favorable reviews and seems very well engineered. Thought you’d find this review interesting as directly compares the R30 favorably to the more expensive Venus 15th (and his considerably more expensive Rockna DAC), which would obviously be a significant upgrade from your Pontus II. Hope this helps, and best of luck.
https://soundnews.net/reviews/sources/gustard-r30-dac-review-the-r2r-perfection/

