Best home security system- DIY?

I am looking for a security system that can be self installed. I am not good with security systems so I don't know which I should buy. I heard good things about GE and it's offered by ADT and FrontPoint security. I will most likely get a contract service later on but would like a system first.

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There are lots of choices for DIY systems. Which one you pick might depend on the size of your home, your abilities to install equipment, budget, etc.

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