https://pcpartpicker.com/list/CbspP3
check it out. its possible to go cheaper but you'd either be losing performance or features, or risking part failure with lower quality brands/components. you woould want to add a 7200 rpm storage drive later on but they're hella cheap for 1-4tb. if you want to get a slightly older CPU, mobo, and GPU, you could probably save some money. personally i wouldn't want to do that as these parts are all ready ridiculously cheap for the performance they will put out.
this machine would play the newest games on high at 1920x1080 with 120+ refresh rates for sure.