I built my own. These days, you can rely on Linux on fairly low-end CPUs to handle a gigabit of traffic, including IPv4 NAT, IPv6, firewalling, DHCP and DNS.

I built my own. These days, you can rely on Linux on fairly low-end CPUs to handle a gigabit of traffic, including IPv4 NAT, IPv6, firewalling, DHCP and DNS. For serious firepower, Jetway sells a 10 x 1 Gbit tiny fanless machine with a J1900 Celeron and up to 8GB of RAM, under $400 (without RAM or disk). All most people need is 2 gigabit ports and maybe a good WiFi interface -- although I prefer to scatter consumer WiFi boxes around my house in bridge mode.