I WISH I had bought a dremel before I decided to cut my first case. I bought a window kit and then bought the special case cutter that they had on display right next to the window kits. I got home, traced out the window, drilled the pilot hole for the case cutter and started cutting. 3 hours later, I FINALLY had my case cut (after having to recut it a second time because the initial cut didn't allow for the window molding). Oh, and by the way, my hands hurt for the next week from all that cutting!!
Next time, I'm just going to buy a case that already has the window in it, or if I don't do that, I'll be using my dremel.