When looking for a DVR, there are more options out there than models of TVs. That is why I am going to discuss certain topics that are important for you to know and understand before buying your DVR. How do I decipher some of the terminology? Why should I spend my money on one over another? What are the biggest differences in units? What brands are the best? These are just a few of the questions that you may come up with when trying to purchase a security system.