Streamer Upgrade Bluesound Node To Aurender N10

I have the latest Bluesound Node, I run an Ethernet cable direct to it and use it as a streamer only, via coax into my dac.  I am hard pressed to find much difference between streaming vs the same music off the actual CD. It’s like six of one, half dozen of the other,  sometimes I think the CD is a touch better, other times the streamed version, depending on the music. I have been wondering as a streamer only, how much difference there would actually be between the $700 Node and a $7000 streamer like an Aurender for example. If the streamed signal  is already very close to the actual CD, is spending that much more money going to be  actually better than the CD? To me this seems impossible. If it is better, how much better can it possibly be considered the cost of the upgrade?  To me it would make more sense to invest the money in other parts of the system like speakers for example.  I know the Node is not considered high end but the question still remains how much better can it get spending that much on a streamer only?

I am streaming the Node into the dac of a Oppo 205 universal player directly into a Peachtree Audio Gan 400 amp and currently using Magnepan LRS speakers and a subwoofer. The system is quite revealing as far as changes in cables and different recordings. But IMO the dac used is likely the biggest factor in how resolving a system is. The Oppo 205 is a very good player, not top of the heap, state of the art but still a good player/dac nonetheless. The LRS are very good speakers also. Unless you are running the streamer through a $20,000 dac is there really any point to buying a streamer worth several thousand dollars.  In my case I believe spending a few thousand dollars to upgrade to higher model of Magnepan speakers would be money more well spent than upgrading the streamer.