What's the difference between a "decock-only" and a DAO? I'm new to handguns and am having a little trouble with the terminology. I'm looking for a home-protection handgun. I don't want to break the bank (under $500), but I want a reliable gun. From what I've heard, the most reliable handgun is a revolver, but I'm concerned about the small capacity and width of the cylinder (I may want to use it as a conceal carry later on). For the most part though, I've been looking at pistols. I like Taurus, Magnum Research, and Ruger. Can anyone give suggestions as to revolver vs. pistol and manufacturer reliability?