Though your Samsung model is not found. While IR is a good choice, I think you should also consider
1) Lux of the camera
2) covered distance claim (IR got limitation on distance and angle)
Alternatively, if you actually have light here, even dimmed light, my experience no-IR low lux camera may see things even better.
Other than standalone DVR, you can also consider DVR card if you are familiar with computer. Motion detection most likely built in feature of both standalone DVR and DVR card.