Security is so important for an internet server that we provide shared hardware firewalling for free.
Using a pair of Sonicwall Pro4100 firewalls set up as a HA (High Availability) pair for complete hardware and software redundancy, these firewalls are so fast - with 10No 1gbps ports and a throughput of 800mbps per port in firewalling mode - that you probably won't need your own dedicated firewalls to get decent bandwidth to your server.
To make our hosting even safer, we use Sonicwall's ® Unified Threat Management system which includes a powerful Intruder Prevention System (IPS) as well as gateway anti-virus and anti-trojan systems.