Yeah, I know you want to know how to choose the best AR-15 ever made, and accessorize it like the image below, lol
so, I just include here a website I found lately ( URL is http://www.menwithar15.com/), which you will find all the answers there.
If you want defend your home, you should learn how to choose the best tactical shotgun at http://www.besttacticalshotgun.com/, best cause shotgun might be the best weapon to guard your house.
There are many shotguns for you to choose from, such Remington 870 Express or Mossberg 500. Hope you could find the one that suits you the most.