Do you know what CMOS are this 4MP IP camera using? Somehow it is very difficult to get an answer from HIKVISION on a relatively simple question.For the NVR, we would recommend a 7608NI-I2/8P 8-channel NVR
For the cameras, we would recommend either the 2343-IU 4MP Turret cameras (with built-in mic) for longer distances, and for shorter/smaller areas like front doors, porches, etc... we would recommend the 2545-IS 4MP Mini Dome (with built-in mic)