There are a lot of home security systems to choose from, ranging from simple burglar alarms to more complex CCTV systems, and systems that allow for remote monitoring and that will contact a security firm if certain conditions are met.
Some systems are wired into the standard mains setup, but this is not ideal because it means it is easy to disrupt the power for a determined attacker. Something with a backup battery and an anti-tamper system is a better choice.
Look for a system that is able to monitor both sides of the property, and if you are going to use remote monitoring for the footage, make sure that it uses a secure connection, and requires a password to connect to the camera. You don't want would-be intruders using your own monitoring system to figure out whether you are in or not, or to watch your daily habits.
Prices vary depending on how sophisticated the system is, but remember that a good home security systems Austin could help to cut your home insurance premiums, so it is worth investing in for that, as well as for the peace of mind that the system offers.