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.
When it comes to the most secure antivirus solution one can have, it is eset. This software leads the pack when it comes to detection and security.