There are several hubs that support multiple WANs. The only one we've seen that supports gigabit on the LAN side is NetGear's Prosafe Gigabit VPN Firewall 25 with 4 gigabit LAN and dual WAN port switch. FVS124G
But the reliability and ability to configure it to do what is required seems suspect. Evidently Netgear once had an online forum on this device, but because of such negative feedback, they took it down. In this configuration this router would be a critical point of failure bringing the entire system down if it ever failed.