The Cisco SA 500 Series Security Appliances, including this model SA520W-K9 provide a four Port 10/100/1000 RJ-45 (1GB) network connectivity to downstream devices, including a single WAN port. This model also provides wireless connectivity using up to the N standard. It's licensed for two SSL VPN tunnels, which could limit how many connections can be used simultaneously unless more licenses are purchased down the road. It provides all the necessary minimum requirements for any business situation, including an Advanced Firewall, Router, Gateway Antivirus and Anti-Spyware, Intrusion Prevention and Content Filtering.
The Dell SonicWall TZ 205 Security Appliance is a great all in one solution for providing a business grade Advanced Firewall, Router, Gateway Antivirus and Anti-Spyware, Intrusion Prevention and Content Filtering, while also allowing some advanced features like Mobile Connect (iOS and Android connectivity from home) as well as a more functional VPN out of the gate, with 10 VPN Tunnels, two SSL VPN Peers, and unlimited VPN nodes. Wireless N standard capability is also a standard feature, there are also five 10/100/1000 (1GB) downstream network interfaces, as opposed to the Cisco device above only having four.