My primary would have to be Arc LS Rev1, modified with reflector, HD and AA/AAA/123 "fatty" pack. It's a great package! it's almost always with me. I have it backed up with my Watchlight (watchband mounted flashlight). Between these two, I rarely need anything else.
I suppose my second would be my VIP with BH. It's just a touch too big for me to comfortably EDC, but it's multiple brightness levels and throw in high are incredible, especially for a 1x123 light.
Honorable mention goes to the PT surge - it puts out plenty-o-photons for only a few bucks. Fill it with bulk 8xAAs and it's not only bright, but cheap to feed.