If you are comfortable self-monitoring, we use Arlo Pro + Pro2 cameras. They are amazing. Got them on sale, installed them with a few screws and wifi, setup my preferences for pinging and scheduling. I know exactly what is going on. The app lets you allow access to friends, emergency, and housemates, so they can also received notifications and view camera activity -- good for entry ways and package delivery. The whole set (on sale) was around $1k for 5 cameras, 2 security lights, a door bell, and a base station. The subscription plan for additional features (detection of what kind of movement: human, animal, etc, as well as emergency connections) is less than $100 per year.
Arlo is my favorite system so far. It is mostly easy to setup and it requires very little maintenance if you hookup a charging cable to each camera. Otherwise, batteries will need to be recharged/swapped every 8 weeks roughly based on usage.