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The reason I was thinking bright is because I do quite a bit of night diving. I'm not sure what to go with because I do a little bit of everything. I live in the Boston area and around here I'm doing a lot of colder and murky diving (which I don't really need anything too crazy for) as well as diving at night (which as you said, a bright narrow light would probably be best), but I am also ALWAYS traveling down to the Caribbean for work, and many other tropical locations around the world doing night dives as well.
For traveling, for tropical night diving where the water is clearer and where you also do day dives IMHO the Mb-sub X1-VB is hard to beat. A little pricey but the quality is amazing. The light comes in two configurations using either 3xC cells of 3xAAs. It has a variable beam from 3degrees which is great for day use looking under ledges etc, to 25degrees which in clear water at night is great. Its lumen value is 250 but puts out 19,000lux in 3 degree mode which is pretty powerful. Remember too much light simply scares everything that you are trying see away. I have also used this light when lake diving in NZ where the water is pretty murky and again in 3degree mode cut through the murk pretty well, a little brighter would have made it perfect. They also make a 700lumen light which is very nice but the beam angle is around 12degrees in clear water its great but its a little wide if the vis is low.
Take a look at Light-4-Me lights they have some interesting offerings with good specs at very reasonable prices. In the US they are sold through Tec Dive Gear, Ive had a couple of conversations with the owner he seems like a nice guy.
Now if most or your diving is in murky water, where you are not looking specifically for marine life and where the ability to signal your buddies etc is required, then of course narrow and brighter is better.
Just for info take a look at, Mb-Sub, Light Monkey, Light-4-Me, TillyTec, they are all in the upper price range but all make great lights. I have used Intova and DiveRite lights, they are nice lights and relatively cheap but not the lumen output you are looking at.
Good Luck.