RTX 4090
Ultimately, you can choose whatever suitable case you want. It’s your eyes that will be clapping on it every day. Still, there are certain practical benefits to taller/wider chassis designs: they tend to include more pre-installed case fans, for better cooling, and they’ll also have more room to mount the radiators for all-in-one (AIO) CPU watercoolers. Bigger cases also have more space for chunky CPU air coolers and longer graphics cards, so keep that in mind if you want a monster GPU like the RTX 4090. If you’re unsure if something will fit, check the dimensions of your preferred components against the "clearance" specs of the case.