ASROCK X370 Taichi (with 10 SATA3 + 5 PCIE + 2 M2 with limitation on PCIE).
In this condition, no need LSI and the total cost is lower.
A low video card is necessary for R5 1600 AF (and any CPU without IGP). Just for serveur, GT710 or GT1030 might be suffisant.
I am also on going for this setup. (+ a high end graphic card in passthrough for HTPC under VM)