I carry this one on me all the time, Ultrafire A10:
http://www.dealextreme.com/details.dx/sku.19187I *really* like this light! It functions flawlessly and is very bright with a NiMH rechargeable AA installed. The best LED flashlight I have ever bought, even though it has the "Made in China" stigma attached to it.
By the backdoor, I have a Maglight 3D LED
For a headlamp, I use the Petzl Zipka Plus
On my shotgun, I have this one mounted, Ultrafire 502B:
http://www.dealextreme.com/details.dx/sku.16178This is another great flashlight made in China. It is well made, solid as a rock, functions flawlessly. I personally have found no reason to go for the much more expensive SureFire over this light.
And then for backups, I have five million+ other LED flashlights laying around the house. You can't walk two feet without tripping over one.
Note: All of the above are LED flashlights. I don't buy incandescent anymore.