Oh, we get to have multiples?
Thought we were just picking one....
Well, if we are able to specify a shotgun, then I would probably go for a stocked pump like the 12 ga. Winchester 1100 with both 18" bbl for home use and 22" bbl for hunting. Presently, I have the 1100 with 22" bbl.
Being raised in Tennessee (brushy hollows, mostly mid-range shooting) I would wish for the scoped Marlin .30-30 I was raised on. After moving to Colorado and seeing that hunters there often shoot across valleys, I realized the differences terrain makes on rifle selection, hence my response that, if limited to only one long gun I would go for the Remington 700 series. Unfortunately, I loaned my Marlin to a friend's husband for deer season once and neither he nor the rifle ever returned.
Two good rifles and a shotgun would do me unless I became convinced we were heading closer to a complete breakdown. I have a couple of friends/family members who invested in AR and AK clones and they look nice, but don't seem too practical (to me). There are a lot more handguns higher on my shopping list than any of the assault-style weapons. To each their own.