If there was some advice I want to give folk it's this simple. Used gaming PCs are usually a bad idea. Not only is it old but the stress of gaming may mean it needs new parts. It doesn't tell us what parts but most folk do not want to learn how to repair their PC.

The third one is sans OS. Another painful lesson to be learned. I don't recommend such to folk that want to use a PC.

Number 4 looks eerily similar to Tomshardware's Red Devil at http://www.tomshardware.com/reviews/build-your-own-budget-amd-pc,3807.html so if it's a good build it should be OK. Number 5 is a spin on number 4 so same comment.
Bob