Thanks for the reply. I have 8 cameras, but if I went to 4K I would likely only need 6 with the wider field of view. They are all outside. I could always add a few more to basement and garage, so at least 8, but option for a few more is fine.
No budget in mind. I see cameras from $200 - $5000 each. My guess is on the lower vs higher end of scale. This is for home use. The main goal is deterrent but would be nice to be able to see faces and read license plates if something sketchy happens.