I would have to choose a good pump action shotgun. Maybe a Rem model 870 chambered in 12 gage. You can outfit them with tons of goodies, and as stated before they can perform many functions well. A slug will drop most deer and other large game if you can stalk to within range. Buckshot will drop most home invaders and birdshot will take down any small game at a reasonable distance. You can swap out the barrels for bird/slugs pretty easily,usually without any tools. Pistol grips and fore grips are cheaply had and easily swapped for stock furniture. They are durable, reliable and proven. My choice is a shotgun.