IN MY HUMBLE OPINION!
Autoloading Pistol: XD or Glock in .45ACP
Bolt Action: Rem700
Autoloading Rifle: M14
Assault Rifle: AR15
Other: any kind of mag fed semi auto rifle in .22lr.
Lots of people wouldn't choose the AR15 because of reliability issues, however, for some reason my AR works smooth ALLLLLL the time. Must be broken?
At any rate, I wouldn't mind whipping out the AR in a bad situation.
Also, I chose polymer framed pistols because of the extra shot capacity. That can be critical in a real world situation. Sure you've got yourself 200 mags for that 1911, but do you carry them all on you? Are they all loaded?
As for the autoloading rifle, well, the M14 is about as good as the Garand (shoots the same round), but again, can accept more ammunition in a single load.
Finally the .22lr. Probably the most important. Great for hunting small game. Great for keeping the noise down when you don't want the locals to hear you. Ammo is lightweight, plentiful, and CHEAP!
-Dev