We have an Amcrest system that came with 4 cameras and a DVR (less than $300 on Amazon, last time I checked). It works great. I read the same thing about wireless systems, and decided to go with the wired kind. You can buy additional cameras, if you want more. I like that you can also view the cameras on your computer and cell phone. We can see all around our house, no matter where we are ... even if we're out of town.
(no affiliation)