I have a rather large house and have been thinking of ways to keep it secure for years.  We have done everything from putting in special door locks to getting really big dogs that would guard it at night.  However, we just recently got a Hidden Spy Camera 8 Channel DVR.  This way we can record up to 8 cameras at one time.  This makes our house extremely well secure and also something really cool to show our guests.  This will make them think twice about doing anything crazy.  Because if they try, they will be caught on film every time.