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.