I am not new to guns, just handguns & their inner workings. I will be using this gun to shoot @ the range, home defense(if need arises) & will eventually get my CCW to be able to carry loaded in the car without worries(won't be carrying it on my self, so bulk/concealment is not an issue).This model comes in 3 different versions: 1. Manual Safety 2. De-cocker 3. Double Action Only Can someone explain the difference to me and/or make me a reccomendation based upon my intended use?