I'm looking to purchase a security appliance in the ballpark of $500 to add an extra layer of security at my office location. There are 50 internal users at the office, with an additional 50 external users on our network, at any given time. The 50 external users only access email and FTP services at our office a few times a day, so the majority of traffic originates from the inside of our network in the form of email, web, and other services.
With that being said, which device would be best for simple ACL implementation? We already have a managed solution in place through our ISP in the form of a FortiGate 80C, which handles our UTM requirements, so it's not imperative that this device offer such features. On paper, the 60C appears to outperform the 5505 and features Gigabit ports, whereas the Cisco offering does not. I'm more familiar with Cisco products, as far as configuration is concerned and I would like to install a device from a different manufacturer than what our ISP installed, for this additional security layer, but is the FortiGate simply a much better way to go, performance-wise?
Any and all advice would be greatly appreciated, and I'm open to other ideas, as long as the price remains within the $500 range (give or take $100).