mounteveriss, I see it looks like you're a cadet and in the NG...that old angle head way to large for what it does. From an "operational" perspective, which is vastly different than hiking/camping, do you need a bright "tactical" light for quick, powerful illumination or do you need a low, filtered light for night land nav and reading a map?
There's a ton of lights out there, the LEDs are really worth their weight in gold, but a good xenon bulb is great at maximizing illumination. One of the best "operational" lights I've used are the small Photons (or Microlights by Inova)...which can be attached by a zinger (small retracting device) to your uniform, LBE/LBV or rucksack. In fact, my daily carry is a green covert Photon on my ID tags. LED bulbs will not burn out...or at least have an incredible life span and are much more robust than your typical incandescent types.
Another great light in my opinion is the Petzl Tikka Plus headlight...a very small, lightweight (AAA battery) 3-LED light, that can even take a colored filter lens. For hands-free stuff, it's hard to beat.
I also highly recommend you ask for an Inova X5 for X-Mas

This is another powerful LED light, that is very small with great performance. Since I where BDUs daily, it rides in its little pouch right behind the rigger belt buckle in front of my front pocket...very discrete, very handy. It does take Lithium 3V batteries, but I'll talk batteries later.
Another light that I thought was more hype than performance is the Phantom Warrior light. It's a 4-AA dual LED light. It's design is actually to use minimum illumination for a given "tactical" need. Plus it's pure white LED, which is adjustable, is much better at reading a colored topographical map...also, the military version has the capability to switch the batteries around and use the offset IR LED in the head assembly. Acts like a small illuminator for your NVG use, and yes, it works quite well.
Lastly a good Streamlight or Surefire 6 or 9V light is indispensable if you're needing ALOT of light. They're great (aside from the "blind the bad guys" use) when searching for lost sensitive items, conducting staff-duty inspections on buildings, even the clean up and inspection after conducting an ambush. I've got a few Surefires, the M2 is the stoutest, but a good cheap and reliable one is the Streamlight Scorpion...my latest is the Steamlight TL-3 (xenon), a powerful 9V light that seams pretty robust and much more affordable than the Surefire 9V lights.
As to batteries...go lithium as much as you can. They are less affected by temperature extremes than regular alkaline batteries. They have a great shelf life, don't "leak" and corrode your device, much lighter, last much longer, and can be stored in the device and relied on much more than alkaline batteries...Now, with that said, they have lithium AA, 3V camera batteries and now have AAA lithiums. I try to keep all my duty devices using AA and 3V (a few AAA slip in at times). AA's are pretty easy to find, as are the 3V batteries. As a commo guy, the 3V batteries are used in our COMSEC devices, and are quite available if really needed. The new Army GPS, the DAGR, now uses AA batteries...and they're common in the Army system as well. The little Photon-type lights typically use the CR 2016 or 2032 lithium coin batteries. I've only had to change batteries in a couple that are about 3-4 years old

, that's why I usually have a couple on hand...they're light enough that a few won't be noticed and having a backup is handy.
A lot of choices, but my primary lights are:
- Photon/Microlight (a few, red, white and green)...awesome!
- Inova X5 (both a white and green)...long life and great short-range illum!
- Streamlight TL3...not the LED model, but great for long distance illum.
- Petzl Tikka Plus...the most used light...and the handiest!
A lot of choices, just depends on what you need based on what you plan on doing.
ROCK6