I’d keep them separate unless you’re severely space constrained. If you’re happy with the Aurender then I’d just add the best streamer you can that’s in your budget. A good bet is the new Innuos Pulse Mini that’s $1250 and includes their Sense app that gets very good reviews for both user interface and sound quality, which is very important and often an area where streamers can fall short. Innuos also offers excellent customer support if needed. Just one option to ponder FWIW.
Ethernet streaming
Many high end dac’s now have built in streaming capability via Ethernet. Is this a better way to go than adding a separate streamer to feed the dac? In my case, streaming Qobuz and using roon. Also have an Aurender dac/pre that wouldn’t be needed if dac only streaming was used. Wondering about the advantages and disadvantages of these two approaches. I’m sure this has been discussed before, but I can’t find it.