I did tried Denafrips, Musician R2R DAC’s , but the best DAC handbuilt in MN usa I think is Audio Mirror Tube R2R DAC’s.
I had Audio Mirror IIISE DAC ( one of the first DAC"s ) , so if you think about the parts inside vs DAC cost, this DAC had one of the best and most capacitors you can buy Duelung copper $250 each, vs if you think Holo May KTE have some capacitors hidding the brand and Mundorf cheaper line $30 each and between those capacitors alone sound is very different. Read here the sound: https://www.humblehomemadehifi.com/Cap.html , as you can see they all color the sound a little, so Audio Mirror decided to go pure copper Lundhal Transformers ( $600 each I think ) coupled in the next model Tubadour IV is what I have now $5k retail plus some extra’s in the linear power supply ( made in Italy ) and jitter, clock updates and if you think about the parts probably almost a have $ vs retail is the parts, compared like Holo probably 15% is parts, and Audio Mirror probably 40-50% in parts vs Retail cost, and on top you can Tube roll 6922 one tube inside if you like to adjust to your liking https://www.audioasylum.com/audio/faq/joes-tubes.html ( different tube roll ) . I can’t wait till I get the Tubadour V. So my Tubadour IIISE sounded so good, tonality is spot on vs Musician Pegasus was warmer, top rolled off for sure, only better thing was a little more center image. But When I got IV - oh boy, center image and details in the space came to live, layers in the space with weight, imaging - I could almost touch the singer is like in my room , nothing fatigue and sound liquid transparent ,open, tonality is perfect very neutral sounding. LTE is probably good also, but again - capacitor coupled and not expensive one. Another probably good is HV line from T+A is build to sound like tube, I believe is a good brand to but I didn’t hear them all. But Audio Mirror is R2R and tube and best transformers coupled , Gaia Feet,, Furutech socket ! so nothing in the market I see better yet. Good luck!