I know the thread started with a request for no fancy jargon - just the perfect light for your needs. But it has quickly become obvious that there is no such "perfect light." What you're after, I believe, is a light that as yet doesn't actually exist. To meet your initial, simple requirements of bright, long-running, and durable - what you need is a dimmable 2x123 1W LS. Oops, there I went with the jargon - but nothing too arcane, I hope.
With the battery capacity of 2x123 cells, the brightness of a spec-driven 1W Luxeon and the long-running ability of dimming the Luxeon to the level of an Arc AAA - all in the form factor of Minimag - I think you'd have a perfect survival light. Of course, the A2 is going to come pretty close to this ideal. But for my survival money, I want 100% solid-state (no bulb to break).
We are getting to the point now with these insanely bright lights, that they can only be useful for short bursts (due to heat and/or battery consumption considerations). Which is great for many applications like military and law enforecement. But for survival, we need a way to dim these monsters. My typical use for a survival light would be almost all low-level lighting, with the rare full-power blast for picking out the meanies in the jungle.