We didn't have a specific budget in mind, but to give you an idea, we've spent about 12k on what we have thus far. At this point we have only paid the deposit on the system so we will still withhold the rest of the amount until things are brought to my satisfaction.
And as far as good night vision, yes it's a requirement. I'm not opposed at all to using IR to light up the areas at night, I just need a good quality FOV at 40-60 pixels per frame.