Consider the digital end just like the analog end. Each component is critical and must be of equal sound quality… and upstream matters most. If you have a high quality turntable, phono stage in front of your preamp… digital is the same thing (streamer and DAC).
Today’s streamer can perform on the same level as analog… so nearly infinite music for nearly no cost (after initial purchases). Typically it can cost a little bit more to get a digital end to sound as good… although highly variable say 10 - 15% (not by randomly choosing by cost… carefully chosen compatible devices). If you are slowly working towards a better system, get separate DAC and Streamer… skip the CD player… they are on the way out.
So with that in mind. I highly recommend Aurender. I still own two… a budget N100 and their flagship W20SE.. Truly remarkable devices. Your strategy could be to get an integrated streamer, Streamer and DAC… then after a while, get a much better DAC… then in a few years upgrade to a real high end Streamer. Or pick out a high end DAC and streamer at once… more than twice as hard. But like most high end systems…. Research… Research… Research. Happy to help further… but need to know what you got now and what kind of budget you have. But in general, A $25K streamer sounds significantly better than a $10K… which sounds better than a $5K, and a$2.5K, and a $1.25K streamer… same for DACs.