In my situation, a SHTF scenario would most likely consist of urban survival, or at least me fighting to get OUT of an urban area. Therefore my top three choices would be:
1. Ruger Mini-14 (Tactical)
2. Remington 870 (Tactical)
3. CZ-75B in 9mm
The Ruger and Remington would be the simple black tactical versions, without any fancy gizmos or scopes added. Both are short and lite enough to conceivably be carried together. The Rem and CZ together would be well under $1000, as would the Ruger.