I cannot claim my choices are the "best" or are the best to suit anyone's particular needs, but I can list what I have and why.
ARC AAA+P in my pocket all the time.
A more affordable option is the Fenix E01 and I believe it's brighter based on just using both. Either one is small, light-weight, provides more light than you want to read a map and have good run-times.
Gerber Infinity Ultra on the nightstand for regular nightly forays about the room without blinding myself. I calculated that this light has been switched on and off approximately 8 times a night, 365 night for about four years (well over 10,000 times) and I change the AA about every six months. Built like a brick.
Surefire L1, Gen II (not the Cree) in the "go-bag" for the economy of single CR123A use at low, low and more than adequate "high" for general use. Great all around light but expensive. I cannot say it's worth $135, but it's deffinitely worth $100, which is what I recently found them for.
Fenix L2T w/ CR123A body in the basket with the 2-way, cell, and wireless I leave for my wife in the AM when I leave. Two levels, convenient size for her and light weight. Two levels, both useful.
Fenix TK20 in the Jeep's glove box. Holy crap, Batman! This thing is BUILT! Very good "high beam," exceptional color rendition, very useful "low beam" for general use. Tac-switch, blah, blah... New one but I am liking it a lot.
Fenix TK11 - WOW! I still can't believe this is an LED light! Well built, good size/weight, tac-switch. My wife and daughter just say "that's ridiculous" when I turn all the lights off and fill the room with light for giggles. What they are refering to when they say "ridiculous" is how bright it is, not that I do that for kicks. They have come to accept that I have three "problelms;" a knife problem, a bag problem and a flashlight problem. This one is on the nightstand for "oh-sh!t" moments and to "sweep" the yard for coyotes before turning her lap dogs out for a whiz after dark.
I have owned a number of other lights and have considered quite a few more which I feel are excellent lights (like the Nigtcores) but try to keep it "sane." If you need something to overwhelm a bipedal invader from a distance, I am not certain any of the super-bright Cree LED offerings are necessarily the best bet, especially if it does not have to be super portable (pocktable) and you wish to maintain that distance-advantage. They are, however, a serious leap in technology for brightness and runtime over what was available just a couple years ago and are "something else" inside a building or for identifying distant objects. Up close, I wouldn't want one pointed at me. Olight looks good too and there is one rated right up there in the "lumen department." Surefire G2 seems to be a good value in this type of light as well.
All my "incandecents" and c-cells/d-cells are gone. With what I am getting out of the TK11 for brightness and some others for their very low-"low," I am not missing a thing.