Antipodes S40 and K41 have ethernet outputs and are superb with the Bricasti. I haven't had the 41 here as it is brand new but had the 40 here for most of last year and used it with the M3, M1 SE and Weiss at different times. It is a great match and will be a HUGE improvement over your Mac.
The S40 is a good, high powered server that you can add too through time. They have an upgraded LPS, clock, etc...
The K41 is intended to be the best, standalone server with the best ethernet output available. It has Antipodes better boards and best tech with an on-board LPS, etc...
Full disclosure, I am an antipodes dealer but I actually have direct experience with this combo and it really is superb.