Shotgun and lots of shells. Unless you live on a large property, then probably a good rifle in .308 with a scope and a bunch of boxes of match-grade. Either way, you can only fire one weapon at a time, but you’ll still need lots of rounds for whatever you get.
Shotgun, check. Hi-point .45ACP carbine and handgun, check (work great and share mags). Looking for something now with some range.
Private gun ownership will be banned by 2016. All will be turned into Government—as will all private gold.