Not a direct answer to your question, so pardon me while I head off on a tangent ;-)
A lot of people just go out and buy a generator to be prepared. However, I think that there are some other issues to consider.
1 - how much power do you need? Will you be powering a well pump, air conditioning, furnace, big screen TV, refrigerator, or just a couple of CF lights? Do you need a 240V output as well as a 120V? Add up all the loads you want to power at the same time, and take into account the extra start up current needed by motors and compressors.
2 - How are you going to connect to the loads? If you need to run hard wired appliances (furnace, well pump), you need to buy an approved transfer switch. Get it installed by a licensed pro, and inspected. Do not back feed thru a dryer outlet. Safety is very important. If you are only going to run smaller loads (fridge, pellet stove, etc), extension cords may be adequate.
3 - What type of fuel will the generator use? Gas is fairly typical, but does not store well. How long do you expect to use the generator for? Do you have room to store enough gas? A smaller generator will use less fuel, but will provide less power.
4 - Where will you run the generator? It has to be outside (do not run in an attached garage!). Do you have a bit of shelter for it (keep it out of the rain/snow)? Some generators do not like to be run in cold weather (mine states under 40F, carb icing can occur unless you provide a cold weather shelter). Also, they can be very noisy.
For some, and inverter and a battery is the best emergency power setup. For others, a small gas generator is ideal. Whole home systems are also available. however, whichever route you go, be sure to plan for using the system!
We have a Briggs and Stratton PRO4000, nice machine, well regulated outputs, but the thing weighs a ton! It has the Vanguard engine, which is very quiet and seems very reliable. Don't forget to stock up on extra filters for your machine. I have also heard good things about the Honda and Yamaha generators.
Cheers
Kenny