GAMDIAS White ATX Mid Tower Gaming Computer PC Case w/Tempered Glass, Built-in 4X 120mm ARGB Fans, Support Up to 6X 120mm Fans, 360mm AIO/Radiator, 340mm GPU/VGA, 160mm CPU Air Cooler

200 FPS for $350-450 is a bit unrealistic, but a decent build is definitely still possible. I’d buy the RAM and graphics card used and do something like this: https://pcpartpicker.com/list/wwH3w3 Edit: The other commenter picked a case that was a better deal: https://a.co/d/06O518bY

Gamdias on Amazon are usually on sale, decent price for an atx with 3 fans https://a.co/d/0dy20XCF