I'm putting together a barebones server to run pfsense on. So far, here's what I've come up with:

In total, I've spent $400, give or take a dollar or two.

I'm shooting to put together something comparable to the Protectli FW6B because the Protectli would have cost me $568 and I didn't want to pay that much. We'll see how it goes. I'll update this post once I get everything up and running.