What is your price range, and what features do you want? You can get any decent basic home security system for several hundred because they want to nail you on monthly monitoring fees. ADT, Brinks, Honeywell are all well known names.
There are things you can do to prevent break-in like adding bright outdoor lighting, use deadbolt locks that require key from both sides, keep bushes and plants from covering 1st floor windows. Or get a dog.