Amazon.com: Zyxel ZyWALL USG50 Internet Security Firewall with Dual-WAN, 4 Gigabit LAN/DMZ Ports, 5 IPSec VPN, SSL VPN, and 3G WAN Support : Electronics
ZYWALL-USG 20 by ZYXEL - Buy or Repair at Radwell - Radwell.com
Advice picking the right firewall for this network