Nowadays buying branded HP or Dell machine is not very popular because they're very expensive and less customizable.Most of the gaming rigs are assembled.So its better to make your own rig.You can have many benefits with this. First thing is buying a casing with enough space It must have at least 3 cooling fan spaces.About 4 slots for HDDs and DVD/Blu Ray roms.And of course a slot for a multi card reader.If you wish to make a gaming rig the motherboard must be a full sized ATX.So the casing must be able to fit it in.And the look for the latest gaming casing from cooler master and thermaltake. 25 of the best cases for your next PC build Get the best power supply you can afford A great power supply can protect your rig in many ways.Low quality power supplies may mostly damage your hard disks.A good power supply can be even used for years. Choose a Great Motherboard Not the latest is the best.Full ATX boards or Mini ATX board is ideal,usually the Intel z7