What's the build for? Gaming, image/video processing, CAD, etc?
What parts do you need? A few (e.g. CPU, motherboard, RAM, GPU), a full system, or the whole shebang including monitor, OS, keyboard, mouse, fluffy dice, and a bag of chips?
No gaming some CAD I was going to build complete less keyboard mouse displays, I run 2, mostly I spend my time watching videos. But now my current motherboard is getting flakey so I think I will just replace MB and CPU might have to change ram, would also like to add SSD m.2 maybe