If world war three occurs, I believe the main focal point will be the middle east, since ever other country seems content to behave itself except Israel and their arab neighbors. (i'll leave it up to you to decide who started it)
With that said, if one was really pessimistic and wanted to prepare, I'd make sure to have plenty of food, land for growing food, extra batteries, a way to recharge the batteries if the power goes out (solar rechargers come to mind unless you can afford your own self sustaining windmill), water, a good shortwave radio, guns, ammo, toilet paper /ubbthreads/images/graemlins/wink.gif some silver for bartering, and anything else that sounds common sense. Think "sam's club" ... I myself would also carry aluminum foil to take advantage of the limitless energy of the sun.
The best flashlights will probably be the long lasting LED lights like an Arc AAA head on a "d" cell battery or even the ones you shake to recharge that need no batteries. These collector/tactical lights that last for 20 minutes on 3 123 batteries will be of little use. The Arc LS flashlights using 2 AA batteries will probably come in handy... durable, waterproof, long lasting light on cheap, readily available and stockpilable AA's.
I'd try to move as far away from major cities as possible, and for those more worried about power, Texas does have their own power grid seperate from the rest of the nation.
You avoid being hit by nuclear devices this way. /ubbthreads/images/graemlins/tongue.gif Plus it's cheaper with lower taxes and better values for your money in real estate. Buy while interest rates are still low!
You can also look into other things, like solar water heaters and ovens. A piece of aluminum foil can go a very long way into doubling or even tripling the amount of sunlight entering your house during the cold season. You can find instructions for such devices on ebay... solar water heaters - water distillers so efficient that they'll boil water in the dead of winter, all made with free/surplus materials.