Welcome to ASR
@scriabin !
DAC is a solved problem nowadays.
Use the Master Audio Review Index on the site to find reviews of all DACs tested by
@amirm. The SINAD ranking bar chart is a good reference to compare overall performance level.
In short, for $420 you can get SOTA performance with a SABAJ A20. For $1,000 an RME ADI-2 gives you its renown « loudness contour » feature, and a lovely screen to look at. Anything beyond that will pay for improvements beyond audibility, for adding usability features, fancy chassis, perceived prestige, the satisfaction of having a product designed by a renown engineer (such as the Mola mola Tambaqui) or advertised in « audiophile« magazine covers, or, perhaps, the extra spending will just satisfy an urge to spend unnecessarily (which Is perfectly acceptable too, although perhaps somewhat pointless).
In any case, the music you listen to should have zero influence on your choice. A good DAC should be « transparent », i.e., add as little noise and/or distortion as possible. That’s the whole point of a DAC. The good ones do that, and for very reasonable money, which is why DACs are considered a solved problem.
Since you listen to CDs, one last important detail. Do use a CD transport with a USB output to connect to the DAC, and so allow the DAC’s clock to be the « master » that times the digital signal. A good modern DAC will have a better clock than any older CD player. Otherwise, you can also use SPDIF, but please avoid TOSLINK, which introduces too much jitter.
And, of course avoid any « external clock » system. As
@amirm has shown, this will actually lower performance compared to a good DAC with internal clock.
Enjoy!