On the tech side of things, I'm looking at a raspberry pi 4. Apparently RAM is not a huge issue so 8 GB seems adequate. On that note though, would a PI 5 with 8 gb of RAM be better? The 16 GB is pricey. The docs are for a pi 4.

https://ethereum.org/en/developers/tutorials/run-node-raspberry-pi/

Considering the tech specs and cost, sticking with a Raspberry Pi 4 with 8 GB for the documented tutorials seems sufficient. Upgrading to a Pi 5 with 8 GB may not significantly enhance performance based on current needs.