Cases come in all shapes and sizes to fit every computer users needs. The large case for the e-ATX motherboards and the mid-tower ATX case for the mid-range motherboards, are the most common cases on the market. There are also smaller cases designed to fit into a cramped space that limit the expansion options on the case. Thermaltake is a well-known company in the cooling industry manufacturing and selling case, PSUs, and CPU coolers to fit any budget and design consideration.

Link