I have to set up a computer lab 25 laptops running Windows 7. The internet connectivity would be shared using a AT&T UVerse that feeds the rest of the school. Is it better to use OpenDNS to filter website content or just spend the money and get a firewall, segregate the lab behind the firewall and use the App Control Advanced to nail down (social media, site, applications, etc) from the students (during class times). Thinking of a SonicWALL UTM TZ series. The SonicWALL would sit on the LAN not sure how that would work, normally the SonicWALL would be the main firewall. thoughts?