Anyone consider the Odroid H2+? It's a relatively fast CPU (for a router) the Intel J4115, relatively low power (10 watt TDP), max ram 32GB (plenty for a router), has two 2.5 Gbit ports, with an option to add 4x2.5 Gbit for $47. Also has a eMMC and M.2 slot for reliable storage, to avoid any ugly USB connected storage for boot.

Seems like it would make a quiet and fast 6 port x 2.5 Gbit router and run well with Linux based OS, unsure of the state of drivers for *bsd.

I did see a thread about getting it to work well with OpenWRT.