So the big gain you’ll likely see is bang/capability for the money. If you’re careful and wait for a deal, can usually find 1L boxes for like $50-75. Get a cheap m2 ssd (and back up your confs regularly if you’re not running raid z2). The nic is going to be anywhere from about 30-70, but you’ll need to do your research on exactly what capabilities the thing you’re buying has (for example: I had a false start initially, because the RJ45 10G nic I found couldn’t negotiate at 2.5G (what I’m running now), and it’s actually pretty hard to find a 2.5G enterprise nic. Make sure the nic is intel, too - none of that Realtek crap, which is less performant and often has stupid driver crap you have to deal with under Linux and BSD (pfSense). You may want to spend a few extra bucks and get the Lenovo external pcie mount plate/bracket for aesthetics/“don’t stick your fingies in here”, and you will need an adapter for Lenovo’s proprietary PCIe-but-not-a-standard-PCIe-port thing.