I recently upgraded my homelab/self-hosting server from an old Dell T410 with dual X5650’s (2 - 6 core/12 thread CPU) and 24 GB ram to an old Dell Optiplex (7020 I think) with an i5-4590 (4 core/4 thread) and 32 GB ram. Its barely enough for a proxmox host with 5 VMs; but way faster than the old T410.

If you are offering some sort of self-hosting box, would it be bundled with some sort of software for someone to easily spin up whatever services they want?

Are you going to be able to make money at the $150 mark with all this hardware and configuration? If you are targeting people who are new to self-hosting, it will need to be a complete package (will need to have ram and storage installed).