And if you’re allergic to buying used, there’s always the mini computers.

It does affect LAN speed, too. Unless you have your high-bandwidth devices running on a gigabit switch to LAN to eachother at good speeds.

It being a 100 Mbps (“Fast” Ethernet) switched router, it’s really only useful for devices that don’t need or use more than 100 Mbps network speed, so like PoE IoT devices perhaps.

Get a firewall. Malicious STUN, ALG DoS attacks, just these things make your NAT router less secure than you think it is.