Following discussion and advice here, I got the zebralight h51, that's a great light. I used it this winter quite a bit for night hikes, and it's really great.
Keeping in mind that each main level setting has at least 2 sub settings, high/low, as Bob notes, the low (set at high) is not only good enough for camp stuff (which I tried one night this winter stealth camping), it's also good enough to read an ebook reader.
The mid setting is absolutely fine for night hiking, no problem at all. Though I found trekkking poles absolutely crucial at night since they really extend the sensory range of inputs for real up/down hiking.
As Bob notes, the high setting is really not needed unless you need to light up the canyon, or maybe find a bear quickly at night, but keep in mind that burns the battery quickly, it's about 60 minutes a high, 10 or so hours at mid, and some huge number at low.
The h51 stays on your head great at speed, the cylinder adjusts very smoothly on the fly, which is very important as you go up/down to get the light in the right place, and it doesn't jar loose or change angles at all.
You could lighten the strap in a couple of ways I guess, might be worth looking into.
After I got a real battery charger with outputs of charge etc, I realized that a 3xAAA device just is not a good idea, I believe the batteries will deliver only the charge of the lowest capacity battery, which means you are really going to be guessing. A single AA is what it is, I can see no reason ever to use 3 aaa batteries, first of all, to carry a spare requires carrying 3, and you have to make sure all of them really match in capacity. Vs carrying a single AA spare that is tested and known re capacity. Of course I use rechargeables, for a slightly lighter earth footprint.