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A List of Top Computer Case Manufacturers. These are the best companies in their field. If you're looking to purchase a computer case then these are the companies and brands you should be looking at. As easy as buying a prebuilt computer can be, there is a definite satisfaction that comes with building your?own PC. Beyond the obvious monitor, keyboard, mouse, and speakers that sit on your desk. The computer itself requires a CPU, motherboard, RAM, graphics card, sound card, network card, power supply, hard disk drive, power supply, and a case to put it all in. Some motherboards may also have those separate expansion cards already integrated. If you're careful, you may even be able to build your own custom machine for less money that it would cost for a pre-built model. When you upgrade your hardware, you can also sell the individual components to help offset your costs. If you're looking for specifically pc cases I suggest reading these expert pc case reviews before making any purchases.