Another DAC that can sometimes be found used that is simply amazing to my ears, and to many on Agon and other forums - is an Okto Research DAC8 Stereo. Not at all sibilant, very natural, engaging, nuanced, expansive, dynamic, incredibly detailed. Many find as good or even better than many d/s or r2r dacs way up to even 5k. Having had both types, and can attest to that. Ultimately, it’s way more about the design and output stage than the chip type. Even though higher end r2r does lend noticeably more stage (in general).