I am looking to buy a shotgun for home defense, but after some research, it has come down to two shotguns... the Russian Saiga 12 or the Kel-Tec KSG. They are both very expensive, for a shotgun and the Kel-Tec is almost impossible to find. If you have experience with home defense tactics using shotguns and or experience with the listed shotguns, your suggestions will be appreciated.