To answer your original question, there are DACs in your budget that some would definitely consider a better choice than the OPPO, but there are also people would have the opposite opinion. Without knowing what you find lacking, I think any suggestions could accidentally send you down the wrong path.
dgcustomerfirst
Should I sell my DAC
I have the upgrade itch and am thinking of selling my OPPO 105 player. Currently I am using the player’s fantastic USB dac to play Tidal web player in my office driving powered KEF speakers. No need for Blu ray anymore and don’t use the unit as transport. If I sell the player for $650 - is there a better USB dac than OPPO 105 in the $1100 range? I prefer advice and recommendations from folks that have heard the OPPO USB dac.