I have a project that i am working on an internet solution for and am looking for recommendations for for a nice firewall that will be able to handle the traffic.
1 Admin Building
3 Dorm Buildings 40 apartments per building
Each building will be connected back to the main building via fiber and cat 6 ran to each dorm room.
500Mbps symmetrical fiber connection for the internet

I have worked with Barracuda, Fortinet, Ubiquiti, Sonicwall, Cisco (not a fan), etc. in the past, but have not had to deal with the amount of traffic i expect on this network and was looking for recommendations for a good firewall without going overboard.

Thanks in advance for any input