Grab a stack of CMR drives from serverpartdeals and you’ll be good.
That being said I’ve run enterprise drives, and consumer drives and for home use I’ve never noticed a marked difference between the two in performance.

https://www.amazon.com/Seagate-BarraCuda-3-5-Inch-Internal-ST4000DM004/dp/B0713R3Y6F/

Raspberry Pi for Home Assistant. And a second hand engineering workstation off eBay for everything else. Take a look at the Lenovo P700.

https://magpi.raspberrypi.com/articles/pi-zero-w-smart-usb-flash-drive