I have several Fenix flashlights. The are very well made and put out an amazing amount of light for an even more amazing length of time. I use Energizer L91 Lithium batteries in mine, which increases the run-time and cold-temperature performance.

The only complaint I have is that the action on the twisty cap-switch is very stiff. A little silicon lube on the threads helps a bit, but still it can be a struggle to work the 1xAA/1xAAA flashlights with one hand in the cold.

You might also want to look at the Maratac AA from Countycomm.com. Not quite as bright on high as the Fenix, but it has a low 1.5 lumen range that lasts 100 hours and is good enough for illuminating the ground in front of you or reading a menu. The action on the Maratac is also much smoother than the Fenix. The Maratac also has a more useful 18 lumen mid range, and an 85 lumen high. Bought individually and with shipping, the price is a bit lower than the Fenix on Amazon, but you'll probably find other interesting items worth buying on the Countycomm site to dilute the shipping costs.