Add 4- or 8-port GbE NIC to PCIe, add 64GB of RAM, add USB stick for router operating system, and you should be able to handle edge traffic for a small office.

Add 4- or 8-port GbE NIC to PCIe, add 64GB of RAM, add USB stick for router operating system, and you should be able to handle edge traffic for a small office. What's your goal here??? Multiple NIC in ITX form factor, for what?