Finally joined the PCMR
I got a good deal on an old HP Prodesk 400 G3 with 8GB of RAM and an Intel Core i5 6500, and i upgraded it with a 500W EVGA power supply, a Sapphire Nitro+ rx580, and adding an ssd as the boot drive. I think it outgrew the case though as i had yo use a hacksaw to make space for the graphics card and the hard drive is kind of sitting on a laptop stand, but I'm gonna pick up a secondhand case somewhere soon
it only cost $150 so far