9mm, .40 S&W and .45 ACP are going to be your primary calibers of choice.
Glock, Springfield XD, 1911-A1, Taurus PT92, Taurus PT111, and the Taurus 24/7 are all excellent semi-automatic sidearms. Since your primary problem will be people who are high on drugs or home-invasion my suggestion would be to go with a .40 or .45 caliber sidearm.
As far as revolvers go you can't go wrong with S&W.
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Science is the organized unpredictability that strives not to set limits to mans' capabilities, but is the engine by which the limits of mans' understanding is defined-Yahoshua
  
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