In reality, any camera is a good camera. Even if the thing don't work, the camera is a deterrent for criminals. They dont know if they are being taped or not. So whether you spend thousands of dollars on a system or just one hundred, you will have more security than you had without.
You should ask yourself a few key questions in buying a system:
Do you want cameras installed outside, inside or both?
Do you have specific areas or rooms you would like to focus on?
Do you want a record of camera data?
What is your budget for this project?
Can you install yourself or will you need a contractor?
Will this be connected to an outside source for protection?
Here is a good video on the tools you will need for setting up your cameras.
