I’d love to take the extra speed if the networking equipment cost wasn’t so crazy.

Then, like you said, on the WAN side you’ve got the monthly internet bill.

1Gbps is the sweet spot, especially since 6Ghz WiFi runs at something like 600Mbps in the real world a reasonable distance away from the WiFi router in an ideal deployment. Saturate your wired, and you get a slight benefit over a 500Mbps plan for your wireless.