Now that I work only 1.5 miles from home, I'll add what I'd grab if I had to leave home.
Many cases arise in my mind:
1) A defensive scenario where safety is my first concern, I'd grab an AR and the GP100. Ammo-probably 210-280 rds for the AR, 24-36 .38/.357
2) A "low profile" scenario where I don't want the fact that I'm armed to be known, then the choices are the TD 10/22 and GP100. Ammo-2-300 .22LR and 24-48 .38/.357
3) Lastly a variety of hunting/self defense where conditions may change the firearm and ammo makeup. This could include anything from the firearms/ammo above to shotguns, centerfire rifles and/or rimfires and ammo accordingly.