The SOPHOS SG series UTM products are perhaps the most complete firewal solution that ICE Systems sells and supports.
We have been fans of this technology for more than a decade and became a comitted partner for the product when it was a software-only firewall out a Germany called Astaro.
It was great back then and has improved and matured over time. The SOPHOS SG firewalls include wonderful drag & drop interface that makes it easy to navigate the robust feature set.
Wether is be a software (virtualized) or physical applicance, this product can handle any perimeter networking job - including those with atypical or non-standard requirments