Fortinet has been the leader of the pack for years. Their firewalls with the optional antivirus and malware detection provides a very secure network.
CISCO is a long recognized baseline for switches and routers. Recently their firewall solutions have started to take off and are becoming a force to be reckoned with.
Linksys is the entry level router / firewall. Whilst not a true firewall, it can serve the purpose if coupled with eset on the desktop.
Avira is an economical Anti-virus solution which can be used on all of your devices.