As an alternative to the more expensive low light cam, I suggest you look only at the Hikvision EXIR models. It's IR will easily illuminate faces out to the street. The low light cam adds little but expense.
You are going to need to choose the correct focal lengths for these cams. It's a tradeoff between width of coverage, and putting enough pixels on the face to make a reliable ID.
The cost increase of better low light cameras is probably mostly in the glass. F1.2 vs. F2 in the standard cams. With proper IR illumination f2 is fine.
With the EXIR you get a bulb that looks like a red light on a transformer, as compared the more diffuse glow of standard camera IR LEDs. This may not be desirable if the camera is too low to the ground.
You'll need to do quite a few things right for this system to work well. Are you covering the front of the house?
Search hikvision exir on youtube.
Also, if you plan to do this yourself, I suggest you buy just one EXIR to start, and a POE injector to power it. See how the setup works. See how the image looks at night through the web browser.