My setup (slow, but fast enough for what I use it for):

Intel NUC N3700, 8GB RAM, 2TB SSD Bought 2 years ago, had it run for a year with a 1TB SSD, then replaced with a 2TB one.

Running Bitcoin Core, Electrs and a couple of non-BTC related services. No LN node.

No pre-packaged stuff like Start9 OS. Plain Ubuntu.