What security components give you the most bang for your buck?

Recently moved into a new house. ADT guys in my neighborhood today got me thinking about home security. I’m looking to do a DIY system, although I wouldn’t necessarily be against a monitoring service, since I would get a good discount on insurance.

I don’t want to go all out and get a full system right away, so I’m wondering, which security components will give me the highest ROI on a budget of, say, $200-300?

submitted by /u/heir-of-slytherin
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