Streamer with built in DAC...is there much difference between brands?

I’d point out that your Node 2 is many generations behind the current Node. I started with the 2i when at the time reviewers said it had better SQ than the 2. Then I upgraded to the 3 (Node 130) which to me sounded better than the 2i. Additionally, in both cases I was able to further improve the SQ by an easy DIY mod to change out the PSU for an external LPSU. So assuming the rest of your chain is comparable or better than teh Node 2 and that you are happy with the Blusound app, you would probably experience a slight increase in SQ upgrading to the current Node.

If you want to go further you can then add a better DAC. I later added an external DAC, using the tweaked Node 130 as just a streamer and then a Innuos Phoenix USB reclocker between Node and DAC.  To my ears I felt like I needed to spend $1500 on a DAC to improve the Node 130 with the upgraded power (I settled on a Gustard X26 Pro)

The OP is asking (obtusely) about a Streamer with built in DAC.. .I upgraded from a Node (?$500) to an Auralic Altair (Streamer with built in DAC + analog input and volume control), used it only as Streamer / DAC.  The cost was over 2k and the upgrade was significant.  For the cost I really like the Altairs, but I doubt most will be interested in a defunct company.   Too bad, their products are nice.

My system is a new Belles 501 amp and Fritz speakers. Both are new.

With essentially the same rest of the system I have owned 3 streamers. 2 lumins and an orchard audio. There have been pretty marked differences in all three. Between the lumin d2 and t2 I would doubt that anyone with decent hearing wouldn’t be able to hear the differences, they were fairly dramatic to me. With your system, going to something like a used lumin t2 would be a revelation - even moving up a little to an orchard audio streamer would be a nice improvement. You just have to try back to back to really know. 

++ To most of the comments. There are clear differences as you go up the price ladder with DAC/Streamer combination units. I have a Marantz NA8005 I was looking to replace. I have a Marantz AV 885, with B & W CM10 speakers and find the SQ on the Marantz NA8005 works well with the combination. Am running RCA (analog) into the AV unit.

Because I wanted to try the BlueOS software I tried a Bluesound Node Nano. I find the Nano greatly lacking in clarity and detail compared to the NA 8005. I am also auditioning an Eversolo DMP8. Initially I found the DMP8 lacking in the low end UNTIL I stared messing with the EQ. All I can say is WOW. With the EQ adjustments I can get the Eversolo to sound exactly like the NA8005 OR brighter/darker etc. Way more adjustable (and cleaner sounding) than my old AKG 32 band Equalizer (which I no longer have).

I have not tried the Bluesound Icon with DSP but after sing the Eversolo App I seem to prefer it over the BlueOS App. Keep in mind App's are a personal preference, there are people who prefer one App over the other for many reasons.