I dont suggest going out and buying any kind of tool. Its really a waste of money. Once you get your case, and decide what you want done. Then figure out what you need. Its not like you need a tool belt and a master degree lol. Most of the time, you just need to drill a hole. So you can MOD a fan on, since its usually not the original position.
Theirs no need to go and stock up on tools. Becuase you'll most likly not need them, or your going to use them only once. If you dont have a drill, im sure you know someone that does. All you REALLY need is a screwdriver and maybe a drill.
Finished With TF.