I just put three perfect holes in my case last night. I used a bi-metal saw that looks like the one posted by jalapeno. They took about twenty seconds each to do. However, make sure you buy a quality saw, because I bought a cheap one first, and it took forever, and when I was done it looked like caaaraaap!!! The one I used was made by DeWalt (~$20). One more tip. Once the drill bit has punched through, let the drill build up some rpm's for a cleaner cut. And be careful, sometimes the saw gets stuck, and the drill can get away from you. Peace.