OT - "open source" firewalls and hardware.

Flame retardant thermal ware in place. In the Dim Time, I used IPCop for a few years. When support for that faded, I opted for a hardware unit provided by a vendor I was a "partner" with. They discontinued that platform and will not support it in the future. I'm facing pursuing upgrading with them or returning to the open source playground on either existing hardware or an APU1 or APU2 type box. Suggestions? Pointers to current "best in class" information?