Heh. Just sharing my experiences. I went thru this during the 2 hurricanes that hit NJ. I only had 2 Surefires and it wasn't enough. I ended up buying LED drop-ins for my Surefires and a few more 18650 lights and the smaller single cell CR123 and AA lights. I got caught up in the lumens chase but realized they're not all that useful other than for bragging rights. Any time I need a flashlight, I find myself grabbing one of my single cells more often than not, even when I'm out and about. The S10 is my absolute favorite as far as functionality. Small, clips to almost anywhere and with the magnet, it's even more useful.
The light that KDM posted is an awesome deal and would fit 90% of what you want. I just flatout disagree with clipping something that size onto your cap. If you can swing it, I would recommend getting a 18650 AND the S10 with the LiFePo4 battery kit. That would cover you for just about everything you'd need.
Thanks for all the valuable information. I'll keep shopping...............................