I'm looking to get a DVR to catch someone driving across my lawn. I've never seen the output of a DVR and would like some inputs as to what would be acceptable frame rates and resolutions to get a good picture. I currently have three cameras and VCRs going and would like to change to a 4 channel, stand alone DVR unit that is reliable (on 8-10 hours a day). I would just need the most basic features; No remote viewing , no audio. Is there a reliable unit out there that can help me introduce this punk to the wonders of video technology and the workings of the judicial system for $500-700? Thanks.