Mag lites are pretty good. If you remove the guts and replace them with different parts. <img src="/forums/images/graemlins/evil.gif" alt="" />

http://edcfeatures.blogspot.com/2007/01/do-it-yourself-roar-of-pelican-rop.html
I've got one of these and it's just a wall of light.

I have a Fenix T-1 LED light and it's great. Has a high and low and low is usually bright enough. I think that model is discontinued and the current one is tk10 or tk11 or something like that.

This is what I've been drooling over lately in the flashlight world:
TK 40

Fur clog in the sausage grinder