Topping E70 Velvet. Even when level-matched (which most comparators fail to bother with), it sounds a fair bit better than many costlier options.
DAC technology is completely mature. Dacs like the Benchmark DAC3 and Bryston 3 are old news. One reason for this is that DAC technology has largely mirrored the evolutionary pace of other consumer electronics such as TVs and smartphones. The same can’t be said for the likes of 2-channel amps and large speakers. A $300 DAC made today meets or exceeds the performance of $3000 DACs of a decade ago. And no, I’m not saying that as a zealot of the ASR forum cult. I say that because it’s true in my personal experience.
If you want more “air and decay” from your system, in 99/100 cases, the best route is to upgrade your speakers, especially to models that are phase and time aligned and incorporate truly high end drivers. That or invest in room treatments.
In terms of DACs, if you’re convinced of the alleged superiority of R2R, then I recommend going with one of the only couple brands that manage to employ that topology and still manage high resolution: Holo or Denafrips.