Roon is compatible with some of the highest end gear in the world.
There are a variety of approaches that you can take. It sounds like you want a Roon Server on your network that will work and talk to your Savant system and the DBX Venu360. These will range in price from about $500 (NUC) to $35K (Taiko). This is also where you want the most processing power as this is the part of the chain that engages the extremely volatile internet.
The second part is the Renderer/Player. This will take the signal from the server and get it ready to be served to the DAC. This does not require a particularly large amount of processing power. It just needs to be a quiet device.
Third part is the DAC. You clearly know what that does.
You can keep all three parts separate or many devices incorporate two or possibly all three of these features in one box. The best devices/systems I have heard usually embrace keeping things a bit separated. It is very common for a great server to serve as server or renderer. I have a Weiss DAC here that is "Roon Ready" and is a tremendous renderer.
I would probably start by picking the DAC you really like. Depending on the DAC you choose, it may (not in all cases) dictate the optimal server/renderer.
For example, Rockna works best with Rockna servers. The I2S connection breaks each element of the signal out and there is a perfect synch between the clocking on the server and DAC. The Rockna Server with a Rockna DAC will outperform more expensive products because of this synergy.
Same goes for Playback. The Dream DAC and their Transport are best together and greater than the sum of the two parts.
Alternatively, a line like Chord doesn't offer a server and matching with a great server like Antipodes is the best you can do.
I in my system, I have a standalone server (Antipodes K40) and use the renderer in my Weiss for one system and a chord 2Go/2Yu combo into an Audiobyte DAC as a bridge for the other and both are brilliant.
Start with the DAC. Build from there.
