OK, if you are going to do it NOW, go to Wal-mart and your sporting goods store, and buy what ever they have. Time is an issue. You should be searching NOW during the daylight.
I am assuming that you are going to have a whole huge group of people searching, right?
I second Velcro's suggestion (I started the thread he referenced!) That light is on my list of lights to get "complete" my collection.
If I were to PLAN to be out in the dark all NIGHT, in total darkness, no ambient light, a million miles from nowhere search and rescue, and NOT be in a base camp or with a group, but actually hiking all night, and money was a realistic object (can't use 2 M6's in both hands, all night!) here is what I might want:
WALK IN A TEAM OF AT LEAST TWO OR THREE or FOUR.
The middle person would hold a wide area walking lantern. my choice (as of 3 days ago) would be the Inretech Super6 light.
The other person or persons, would be searching with the high powered beams.
Here is what I would want on my body:
One, possibly 2, freshly, and fully charged, Optronics 2 mil CP spotlights, strapped around my shoulder. (30-40 min run time each) Maybe just 1, with a fully charged, spare battery in my backpack. Why this light? Actually I had to use it last night (for real) in a little search and rescue for a "search and rescue" dog (no joke!) This baby lights up the night! I was able to light the dog's eyes up, easily a half mile away or more away, and the beam is just incredible. When you need this light you really NEED this light. It would not be the primary search light, as the battery life is 30-40 minutes. Not enough for a 14 hour trek.
The above mentioned LSI Kohler OR the UKE Sunlight D8 or UKE Light Cannon 100
or the UKE Light Cannon 100 with the optional Lantern grip:
Both UKE lights takes 8 D batteries, and you could throw another set or two into a backpack, no problem, whereas the rechargable light, if it should go out, well, you are out.
(I did not know the lantern option was available for the UKE lights, that opens up a new possibility as to a future purchase!)
A Princeton Tec Aurora, maybe two (they are very light) and wear one backwards, with the blinking mode on, to be seen from a distance from behind.
In my pocket, a Legend LX, or, if I owned one, a SureFire M3, a 2AA LS light, and the Streamlight 4AA, 7 led light.
Water, some candy bars, a poncho, cell phone, a little first aid kit, POWERFUL, 100% DEET bug repellant, and a towel. Bring enought water for you, plus water for your search and rescue person.
3 Princeton Tec Surge's in the backpack, just because I have them, and find that they work great because of the wrist lanyard, for having a light, but still being able to use your hands when necessary.
HIGH PITCHED POLICEMAN's Whistle around your neck.
I am sure that there are alternative selections, but I would feel pretty secure in my selection.