I've been using Princeton Tec for around 20 years; their Apex for the past five years - and they've always worked great for me.
But I have tried out a bunch from Petzl, Black Diamond, LED Lenser, etc. For the most part, every brand has their "star" and they're generally all comparable.
So, don't get hung up on a brand. Do some research, spend a little cash, and find what works for you.
There's a wave of rechargeable headlamps coming through now that tend to last longer, and even intuitive headlamps designed to adjust the level of lighting based on what you're looking at.
I would say this:
1. Go rechargeable, and make sure it's one you can use while charging.
2. If not, get one that can use rechargeable batteries, or CR123 batteries.
3. Make sure they're waterproof or water-resistant.
4. Always bring a back up (I don't care what you have and what you spend - electronics crap out all the time!)
Here's a nice alternative that can be used at camp or as a "headlamp"... They used RAM Mounts and GoPro style mounts, so you could mount one of these buggers to your chest and just walk around looking like Iron Man all night. I've done it. It's awesome.
http://www.gearaid.com/shop
The two bigger models are actually "power plants" and you can charge off of them.
I used the Arc for 2 nights in a row and it still had power left.