I think the right way to go is fine a good local computer store with knowledgeable people and get their help parting out and assembling it. You get some repair coverage and benefits like that, they do the bulk of the work, and you can put your own options in on anything you’re knowledgeable about. It’s what I’ve done and it’s well worth it for the small extra cost.
Glad another Marxist said it. The problem isn’t that capitalism was always the wrong choice, it’s that we’re clinging to it long beyond its best before date.