Old laptop w/ an external HDD for storage for now. Figure learn up on what I’ve got on hand and eventually if I want to upgrade to a smaller compact node it’ll be easier.
Discussion
The 1liter workstation PCs with NVMe drives make awesome fast nodes. If your old machine isn't that old it will probably be faster than a raspberry pi based solution.
My old tower from college was the original plan but misplaced a monitor & it needs a serious cleaning. For now older laptop it is