Upgrading my streaming/digital system- what would make the most sense?

Thank for this.
I hace started seriously considering upgrading what feeds the dac particularly as many more upgades have to come to the market since the last time I was looking into this as KNOCK1 pointed out.  And was looking to hear what others have experienced in their own systems.
I would love to try a GRIMM but I have $4-5k budget- so this well outside my means.  But I will look at some less costly alternatives- any suggestions?
I has considered a Small Green Computer with an ultrarendu but maybe I should consider a higher level solution.
Just out of curiosity, is a card/bridge as I have in the Moon, a solution that others like Bricast or PS Audio (previous dac) also offer, a major compromise to a separate streamer?

If the Grimm is beyond your budget, I would recommend the Innuos Pulse.  If you need it to be a server, too, the Innuos Zenith Mk3 would probably make you very happy.

Thank you!
I will definitely look into that.
In fact, along with the Innous I have started researching Lumin (U2/U2 mini), Auralic (Aries G2.1).  If I am not mistaken, and I might well be as I find that often the product websites are not as clear as they could be, the advantage of the Innos Zenith is that I would have it working as both a roon core/server AND as a streamer.   This would mean being able to replace my Macmini and adding a streamer rather than having to upgrade the server as well and adding a streamer. The other brands mentioned above, as far as I can tell thus far, offer streamers only, or streaming dacs, or all in one solutions (server, streamer, and dac). 
I understand that keeping all functions separate is probably the higher quality solution butt the Innous Zenith seems to be a well reviewed so I assume that the inherent compromise of having server/streamer is fairly limited (within the constraints of my budget).  In otther words it sounds like a potentially good solution vs replacing the Macmini and picking a good streamer.

This has all been very helpful to help me think about various upgrade paths so thank you everyone,  Now I am going to have to decide if to go for the dac upgrade first or upgrade what feeds the dac.

My personal experience: I found the biggest jump in sound quality was going from a Mac mini to a dedicated music server/streamer, which at the time was en entry level Aurender. My current server/streamer is an Innuos Zenith Mk 3, I'm using the Innuos Sense music app as I find it sounds better than Roon on the Zenith. 

I also have a Small Green Computer, which runs Roon for my Bluesound speakers around the house. 

The sound quality difference is noticeable between the Zenith/Sense and the Small Green Computer/Roon in my main system. 

the advantage of the Innos Zenith is that I would have it working as both a roon core/server AND as a streamer. This would mean being able to replace my Macmini and adding a streamer rather than having to upgrade the server as well and adding a streamer.

Given your specific situation this makes a helluva lotta sense, and I agree having the streamer and server in the same box is a relatively small compromise (if it even is a compromise, which I have my doubts all things considered) that comes with a big dose of convenience and simplicity. Seems like it very effectively solves all your issues in one box, and as mentioned their Sense app is highly regarded for both usability and sound quality and is continually being improved/upgraded even further, and to top it off their customer service is top notch if ever needed. Handwriting would seem to be on the wall here.