Wow, less than two days and already pages long!
There are a number of good flashlight manufacturers these days. Personally I am
very happy with my Surefire lights and own several.
FrostofSparta, you didn't mention which "pack" this light was for. Giving the intended use of the light might net you different suggestions.
My EDC light is an E2DL. It's tough as nails, bright and has a high and low. Anyone that likes good tools (such as flashlights) should check one of these out at night. They throw like mad and are easily pocketed. I'm not a big fan of the crenelations, but I've gotten used to them. If I was going to replace this light today, I would have a hard time choosing between a new E2DL or an LX2.
I also carry an E1L in my EDC bag (stays in my car most of the time). It's small, is plenty bright on high and has a long, long runtime on low.
I have an LX2 clip on the E2DL and an E1B clip on the E1L... these make carrying them much handier (for me).
I have a couple 6PLED's for the car and for use in the garage. The stock LED module is OK but the Malkoff Devices replacements are excellent. If I wanted another one of these lights today I would buy an incandescent model and order the Malkoff drop-in separately.
My last (and favorite) Surefire is my U2. Six levels, 2 lumen low, 100 lumen high (often tests over 150). It runs forever on low and best of all you can choose the level BEFORE you turn it on. Unlike the E2DL which always comes on on high. This light has it all. Multiple levels, flood, AND throw. Even though on paper it shouldn't, in real-world use it throws just as far as my E2DL while still providing lots of flood.
Unless you find a Surefire retailer, CR123 batteries are way too expensive to buy locally. I buy mine through batteryjunction.com. They have "Titanium" brand batteries for $1.00 each. I've got roughly two dozen of them. I keep spares in my EDC bag, BOB bag and at least two in each car.
Now for the twists.
In the BOB: One of my 6PLED's has a Malkoff M60LL drop in which has incredibly long runtimes on two or three CR123's
or on two AA's. I also have a single-cell extender (makes the light a 9P) that allows me to use AA batteries in the light. I keep AA and CR123 spares in the bag as the electronics in the bag use AA's.
The other "dual-fuel" light is my E1L. I have a spare battery tube that can use two AA's instead of a single CR123. In this configuration it actually has more runtime than the single CR123 (It also ends up almost three times as long, though).
Picture of the two: