Sorry if this is not the right place to put this, I'm new and unfamiliar. I have a 500 dollar budget, and looking to build a pc. Could I do one for 500 that can run games at medium settings? I already have the mouse, keyboard, monitor, and OS. All I need is the computer. Would this be possible? I will upgrade it better over time, but is 500 enough to get me started with something decent? Thanks