I know you asked about the NICs, but I'll comment on switches since you don't have yours, yet.
When I put in 10Gbe on one of my sites a few years ago, I selected a switch (Netgear Prosafe XS708T) where ALL eight ports were 10Gbe (ethernet, not fibre). As I was doing short runs, wanted some key workstations to be on 10Gbe, and the switch was at a good price point, I went with the all-copper solution.
Fast-forward a few years and I recently wanted to do a small expansion of the 10Gbe segment, keeping in mind that all connected devices are now using ethernet. Since then, however, the availability of switches has changed a lot and it's difficult to find copper-only switches with >4 ports for reasonable prices. I happened to find a used XS708T for a decent price, but I concluded that if I was doing this again I would stick to SFP+/fibre rather than ethernet/copper (keeping in mind that SFP+ still has the option of using copper if necessary, via an appropriate transceiver). The motivators were availability, long term cost (impacted both by the switch and the connected gear), thermal signature, and audio signature (more power draw means more cooling).
This may not matter as much if you're only trying to get 10Gb between your TrueNAS and the switch, and then 1Gb from the switch to the rest of your machines (as implied by the "house is wired for it" comment) as there are a lot of switches on the market that have only two 10Gb ports with the rest at 1Gb. However, even there I'd tend to fibre or DAC on the 10Gb segment.
FWIW, prior to finding the used XS708T, I was leaning toward the Microtik switches. I've been happy with Microtik in the past, but have no experience with their 10Gb switches.
