When I daydream about such things, I put a few parameters on the equation:

1. I'm not going to worry about asteroids or gamma ray beams. Anything that will terminate a significant portion of the planet's surface isn't anything I can handle.

2. I only have to worry about the next 30-50 years, enough to see me off this mortal coil, and perhaps to give a head start to the offspring.

3. Water is going to be a huge problem. (It already is in the Southwest and in Georgia.) So you want to be somewhere near the headwaters of a traditionally water-rich region. And you have to take into effect the shift of temperate regions to the north with global climate warming.

4. Nowhere near major cities, but someplace with adequate employment opportunities in your chosen profession, enough nearby farming and industrial/manufacturing so that you're not as dependent on trucking essentials in at $300+/barrel diesel. We're all going to have to learn to buy local.

5. We're going to want to generate a fairly reliable amount of electricity at the home, so reliable wind or southern solar exposure and fewer rules on deploying a generation system would be useful.

6. Decent medical facilities and personnel nearby. We are long overdue for either a man-made or naturally-sourced pandemic, and both isolation and access to medical intervention will be important, the isolation obviously to prevent exposure but also to buy time for the pandemic outbreak to be recognized with more time to prepare for the 3-5 months everyone will be locked down while the authorities get through the usual period of incompetence and begin to get a handle on things, distributing effective meds.

7. Reasonably distant from political and military targets of opportunity, and preferably upwind. These days the biggest threats are single to several incident terrorist events and accidental launches from decaying Russian missile silos and storage depots. I live directly east of Washington DC in Maryland and we all know how big the target painted on this town is.

Except for that ice cave in Norway where they're storing the farming seed stocks for recovery after "doomsday" I can't think of too many places that would qualify. But after all that, and thinking about how hard it would be to convince the DW that we should relocate away from her steady, relatively high-paying federal job, family and friends just because "something" might happen, I usually just stick my head in the sand and cross my fingers that heart disease will get me first.