[Mashiro]

Unless you have a spare and very well isolated room buying a real server is one of the worst ideas ever. It's loud and draws too much power. And the one you mentioned is tad bit overpowered for your use case anyway. I have a NAS running in my room and that thing is already loud enough that I have to turn it of during the night (actually use the automatic schedule to start and shut it down based on set times). If you wish I can send you a sound recording of our server room that runs multiple Dell & HP servers in addition to many switches. You won't last long in such an environment. I can also tell that it seems like Dell is way more aggressive with their fan curves than HP because the Dell servers we have (couple of Dell PowerEdge R630, Dell PowerVault NX3100, Dell PowerEdge R520 & Dell Poweredge R730xd) are much louder than the HP ones (couple of HP ProLiant ML10 v2, HP ProLiant DL120 Gen9, HP ProLiant DL160 Gen8, HP ProLiant DL380 Gen9, HP ProLiant DL180 Gen9 and HP ProLiant DL385 Gen10).

Of course a Raspberry Pi or similar is not going to cut it if you want to run Pfsense and VMs. So I recommend setting a budget and building a small and quite machine yourself. There are many options available actually. Like really small mainboards with all you need (enough RAM can be installed, a good CPU and even some PCIe slots for multiple network cards). There are small form factors PSUs that are very quite and efficient. You can build yourself a small, quite but powerful home server this way. For CPU I would go with AMD given the great performance with Ryzen and still lower cost than Intel equivalents.

My two cents.