I think it kind of depends on your intended use. If you just want to find your way back to camp, then this isn't 'zactly rocket science. This little things are cheap and fairly reliable. I have not had one to fail yet and carry one as a backup and have them around the house and in the truck.They're like, 20 bucks.
http://images.lowes.com/product/converted/039800/039800037879.jpg Personally, I like the Princton Tech Vizz. It's very bright @ 160 lumens, so it is certainly bright enough to meet the needs of field dressing or quartering an animal in the dark. Frankly, if I'm just walking to or from a deer stand, or headed back to camp or the truck, or looking for something in the tent, I really don't need that bright of a light and prefer the red light.
That is a requirement for me, a red light option which helps preserve your night vision. I also have no interest in a separate battery pack.
If you're out spotlighting, coon hunting, or otherwise need to light 'er up, then I doubt a headlamp will do the trick and there are other lights more powerful for that.
Some feel they have to have the most expensive and best of everything and while I don't disagree with "you get what you pay for", (see my sig line) I don't need to pay extra for a light that can endure being run over with a vehicle as a test as to whether a light is adequate for my needs... which is overkill IMO. YMMV and everyone has their own priorities.
So bottom line, decide what your needs and priorities are and based on the suggestions in this thread, buy a light to meet them.