I'd suggest using 10 Gbps Ethernet over Cat6a or Cat7 twisted pair cabling for wiring the house, and DAC cables in the server closet. You then have a choice of

I'd suggest using 10 Gbps Ethernet over Cat6a or Cat7 twisted pair cabling for wiring the house, and DAC cables in the server closet. You then have a choice of domestic or professional quality switches. A decent second-hand professional 10GbE switch -- Arista is good, and 7124 is often under $200 now will be noisy, hot, and use a bunch of power, but will also be a reliable and feature-rich switch. Alternatively, just get a Linksys or Netgear or whatever. Then use second-hand Solarflare 7000-series or Mellanox Connect/X 10GbE cards.