Simplicity is required for a HD flashlight. I would suggest only one mode, and a momentary-only tailcap switch. It is very easy to accidentally "click" a light on in a stressful situation when you only wanted a momentary burst of light.
Check out the SureFire G2L and 6PL. The 6P meets your criteria for an aluminum body, but the Nitrolon (polymer) body of the G2 is still extremely durable. The LED in these lights is rated at 80 lumens. SureFire recently released a LED bezel upgrade for the above lights that puts out 120 lumens. Keep in mind that these are out the front ratings, not the inflated ratings of many other manufactures.
Another option is to watch the marketplace for a G2L host (just body and bezel, with no LED), and buy a
Malkoff M60 or M60L on the marketplace as well. This is a very durable and popular LED dropin.
Take into account that anything over 100 or so lumens will appear
very bright after waking up in the middle of the night, and you can potentially blind yourself, not just the BG, for at least a few seconds from the back scatter of the light reflecting off walls, windows, etc.
As others suggested, look into some low-light training with a flashlight.