I’ve been going down this sort of list myself the WRT3200ACM is falling pretty fast in price (down from $250 to $160 now) meaning it’s probably got a refresh coming. But in my tests it gets about 400mbps down and has fancy tri band wifi.
I still need to modify Rita to properly set wifi ssid and password with that fancy wifi though.
https://twitter.com/ttk314/status/1058763773681385474
As for the other x86 devices, many look promising but i really think there are only a couple of real use cases home router and enterprise appliance. Once your into appliance territory using a big desktop is just better unless it needs to go up on a tower (and I haven’t had to fill that need yet)
For a home router no-fan is nearly mandatory and you really want very nice antennas and wifi cards, for which I’d lean to the 3200acm as the higher end.