Power Supply Units
The PSU is one of the most underappreciated parts of the build. Rather than 'just' provide power to your PC, it needs to be well made, efficient and be able to provide enough wattage for your build, and maybe future upgrades such as power hungry graphics cards. The choices between modular cables (separate cables where you plug in only what you need for your components), semi-modular (the essentials are wired in, any others can be plugged in or left out), or non-modular (all wired in) are personal and depend on how you want your build to look, and how easy it is to hide cables in your case.
