To the OP: Your emphasis on the clock is a mistake, imho. The impact on sound from a quality clock/reclocking is easily measured (jitter). The only source I know of that consistently measures jitter in streamers is HiFi News. So I put together a small database of 13 streamers measured by HiFi News over the last few years; the two streamers costing £1k or less have jitter levels at about the same levels as the 11 higher cost streamers (up to £33k), and these are vanishingly low levels of jitter.
So that leaves only one other area of potential difference among streamers: power supply-related noise. And as some others have mentioned, DACs vary widely with respect to their sensitivity to noise; some are largely immune. Unfortunately, HiFi News measurements of this - thru signal-to-noise ratios - is less comprehensive. However, what measurements they have done on this issue suggest, again, that you don’t need to spend a lot of coin on a streamer. There are well-engineered noise-free streamers available for £1k or less.
Finally, my own experience of streamers over the last 20 years, including a fair number of direct A/B comparisons, has confirmed what the data show. Isn’t it great when the science and our experience are consistent?