Streamer's without built in DAC options?

How come no one mentioned the dCS network bridge?

it isn’t a streamer, you to stream to it, not from it

I also see many recommendations for streamers that aren’t Roon servers. assuming the OP wants a Roon server given he is using a Nucleus,

of course.. given the very vague stated needs, we don’t really know

It doesn't matter to me whether suggestions offered need or don't need the Nucleus in the system. I have it if needed. Or like the ZENith mkIII I can demo without it. So, suggestions are not limited to whether or not it needs the Nucleus in the chain. Its easily removed or put back

Auralic Aries G1 or G2, if you don’t need WiFi, then Aurrender N10 

You don't need a streamer, the Roon Nucleus is it.

I’ve had an Ayre DAC and have updated it since 2011. I recently called Ayre and spoke with them because I didn’t want to spend a lot of money on technology that will change in a years time. I was told that they use a Melco but have had tested, and with good results, many various components including a MacBook Pro. I ended up buying the Bryston BDP Pi, added a linear power supply and so far, haven’t found anything objectionable. Yes, it uses a Raspberry Pi for its processor but the way it’s implemented is critical. Also, the streamer and the DAC are interdependent. I’m betting that for streaming, my biggest improvements will be from adding the Uptone Audio Ether Regen and the Network Acoustics filter. In other words, spending money on usb cable, power cable, switches and noise filters, etc..., you may come out ahead better than if you were to sink all of your cash into one component. Just a thought.