Cooler Master's Pi Case 40 is a relatively nice case for the Raspberry Pi 4. It would've been nicer if they hadn't made it impossible to use HATs by swapping the GPIO header rows & misleading backers, stating the pinout would be fixed during the campaign & changing their tune after funding closed, but it's pretty nice otherwise.
It has a built-in GPIO soft power button, for which they have a GUI tool available on GitHub that is pretty horrifically bloated. It lets you set actions to trigger from a few different press events, apply some pretty mediocre preconfigured overclocking profiles, and monitor frequency/temperature.