We are looking to upgrade / replace our current firewall (Sonicwall NSA4500) with a new one due to soon hosting a parent portal and an ever increasing influx of mobile devices and tablets in the school. We need to link with Active Directory, have very good anti-spam, web filtering, real-time and historic reports, NAT forwarding and work well with terminal servers. Currently I have been advised that Fortigate FG300D is a good option (though the cost is prohibitive as you have to buy a separate reporting device and no edu discount or incentive), Sonicwall are coming back with info on what they recommend (tho' support not great), also interested in anyone's experience of Untangle and Smoothwall in a school environment.