Add an external DAC. Make my Oppo UDP-205 a true top player

i bought a NAD D1050 DAC that i use in conjunction with my Oppo 103. much better than the DAC in the 103. the pair sound phenomenal, but i would be interested in what others in the Oppo community have experienced. i originally considered the 105 but the 103/NAD combo sounded better and cost was about the same.  i heard the 205 and think it's much better than the 105, maybe less edgy, very textured, full sounding.  the 205 would be hard to beat, but just try and find one now.  the prices have gone through the roof.  RIP Oppo

i have a Oppo 105 and would like to add a external DAC that would rival the SQ of a 205 without the huge price upgrade of a used 205. this is 2020 4 years after the introduction of the 205. for a grand their must be something? any 205 owners find anything?  btw, the LKS is no longer available.