you could probably just get a standard hp pavilion model, use potato config, never worry about peformance and use the remaining $650 to buy an actual tower while you're at it
that's what i'm doing right now, waiting on a new processor because intel never quite patched out spectre and kinda trashed my i5
i have a 17" 8gb ram pavilion with quad core amd garbage processor that i didnt know this one had when i bought it, good enough to run the games i want to play provided i dont care how they look. most i can say about monitor ports for this thing is it only has an hdmi port, which can suck if you have an acer monitor that only supports dvi and vga but otherwise you should be fine