Streamer/DAC - Where is the value?

It depends on your longer term goals. Will you keep evolving your system to better sound? Or is this next purchase an end point?

I would recommend an Aurender A200 (combined streamer / DAC)… if you just want one and done. I own two Aurender streamers and cannot recommend them too highly.

If this is a step towards a better system, or really getting the most out of your system, then separates. They are both equally important. Aurender for the Streamer and… in that price range I don’t know the perfect DAC. I will say given the rest of your equipment if you want very top notch performance up to the standard of the rest of your equipment I would be looking in the $4 - $6K each range, DAC and Streamer. [my estimate is based on matching to,your speakers] Yes you can get stuff for less money.

Also, I recommend switching to Qobuz. The service sounds a bit better than Tidal but also has half a million high resolution albums versus Tidal… only a few.

My systems are shown under my UserID.

I like your system - I have Sf Nova's as well and I previously owned McIntosh pre and amplification.

I am biased towards DAC/streamer due to space and simplicity.  I started with Node 2i, then moved up to Moon 280D and now I have Moon 390 which is also a preamp.  The Moon 390 replaced my Moon 280D and McIntosh C2600...it was an upgrade for both.  And I sold the McIntosh for more than I paid for it. 

If you like the streamer/DAC that happens to be a pre-amp.  I wouldn't shy away from it.  Your integrated amp can be used just as an amp and if you decided to go to components a streamer/DAC "Network player" provides you flexibility in transitioning to separates (such as MC 312).  

Good luck in your journey!

Given your budget and the quality of your gear, I'd recommend a DAC in the $3000 range (the Denafrips Venus or Holo Audio Spring would be at the top of my list) and a solid but not crazy expensive streamer, maybe a Lumin U2 Mini or one of the less expensive choices from Aurender.

I'd do separate DAC and streamer; that way you can upgrade either/or unit if you feel the need later. I'll leave the streamer recommendations to others (I use the latest Bluesound Node 130).

Denafrips Pontus II DAC (alone or with a Denafrips Iris DDC which is amazing) and the Holo Audio Spring 3 (Version 2 or higher) or Holo Audio May DAC are great "bang for the buck" DACs.....$2,000 to $3,500

hifi rose 150b is working well for me.  in your price range, tons of features, good visual appeal, sounds great