Personally I bought a Qotom Firewall from Ali Express.
I got the i7 4500U variant, added a 120GB SSD and 8GB of RAM. I have a gigabit connection, run a couple of packages on it, and never use more than half of it’s potential. I have the freedom to experiment with VPNs, packages, etc. without ever needing to upgrade.
I went the overkill route, but honestly I like having a little box stuffed in a closet not wasting a lot of power or making a lot of noise.