Hello,
Even if Peplink balance is a fantastic device, I never use firewall functionnality. I prefer to use a “real” firewall like Palo Alto or Fortinet.
For antimalware appliance, in fact, these kind of device (like fireeye) are quite expensive.
You should have look at Damballa. They offer a Microsensor that can be deployed at branch site (1,5K) and a management console at the HQ.
Hope it can help you.
Regrards,
HA