One thing to consider is what batteries your other gadgets are using. Both my GPS and headlamp, plus my keychain light use AAA.

I am very happy with a Princeton EOS - regulated with three light levels, can use lithiums and rechargeables, which are far preferable to alkaline batteries. The Eos does take three batteries, but that is not really a problem.

For a trip where weight matters, I would tend to load up the light, whichever one you purchase, with lithiums. They are lighter, give more burn time, and work better in cold weather than the other alternatives.

To both Save the Planet and your money, rechargeable metal hydride batteries (Eneloops appear to be the best) are insanely cheap. The current issue of Consumers Reports has a very relevant article on this.

There are lots of good headlamps out there. I think you will find some of the slightly more expensive ones will be worth the price. Goode light is a pretty basic requirement.