I am running Roon Core on a Nucleus server without problems. The primary endpoint is my Marantz AV8801. It took a while, but now everything runs pretty well.
I have a pair of Dynaudio speakers that I like a lot. I would like to use them in an endpoint for Roon in my office/study. So what I am looking for is an amplifier to take the Roon signal, amplify it and drive my Dynaudios. In an ideal world (the one that will likely exist in about two years), the amplifier could pick up the Roon signal either through a wired or wireless ethernet connection, perform the D to A, and then amplify the signal and drive the speakers. Oh, yes, and it would be great if the amplifier could be controlled via an ethernet port instead of unreliable IR.
Using an RPI + RoPieee you can add for example a Hifiberry AMP+ or from the same house you could have a look at the very sexy BeoCreate DAC/DSP/AMP combination.
Any of those get you a fully integrated Roon endpoint with an AMP.