AND to keep the Mrs happy... Make it so the end result looks nice? Another thing to think about for the DIYer.
Many of the suggestions are great! You are not going to prevent someone from grabbing a landscaping brick and throwing it through a window... but from what I have read in most burglaries the perp goes through a door because it is easier to carry stuff out. PLUS, kicking in a door real quick is easier way to get in and get out. The determined criminal will get in no matter what.
Let us not forget why they are criminals to begin with. They do not possess the know how to hold down a job or are too lazy to exert effort to support themselves. They want an easy target. If they try kicking in your door and fail at the first 5 or so kicks and your door does not move... they will move on to the next house that is easier to get in and get a payday.