the saiga 12 is freakin sweet because you have clips and you can buy 20rd drums
so that makes easy reloading but for a home defense id probably go with the mossy 930SPX if you are set on your ways with going with a semi-auto that is. If you still are open for ideas i might consider a pump. a good cop friend of mine once told me, "when someone is unwelcome in your home good guy or bad there isnt anything that makes the ol' heart jump out of your chest then when your in the dark and you hear that shotgun slide cycle.
" thats why the ol 12 pump is right there at my bedside... just a thought.