For case modding I think both a jigsaw and dremel are indispensible. I used a jigsaw ($40 @ Home Depot) for the window (do NOT use a dremel for windows unless you have a lot of time and patience). For dremels, I prefer the corded multipro instead of the cordless version. The corded version has much more power and you can get a kit with a nifty box and some bits for $60 @ Home Depot. Dremels are awesome for smallers jobs (i've used it to cut out grills, cut holes for switches, grinding edges, cut acrylic tubes for my homemade cathodes, snip of pesky hangnails, etc.). It's so much fun to use I keep looking for things to use it on 🙂