I have both a video monitoring/recording on the outside of my house/garage and a separate security system with alarms and keypads for this inside of the house/garage. I did all of the work myself.

A lot of the video monitoring stuff does come with motion detection but it doesn't set off alarms, it just puts the system in record mode. That is why I have both. I wanted a system to capture the images of the people (which allows me to prosecute). I also wanted an alarm system to alert us to people. Wireless is the way to go for both systems on an existing house.

For a one-stop-shop on security systems for the home installer, check out:
http://www.homesecuritystore.com/

They have both video and other security systems.
Jerome