I also really like my Streamlight MicroStream. But the one I tend to carry is this Black Cat light from DealExtreme.com. It's vastly brighter than the Streamlight and seems to be pretty bombproof. I have half a dozen of them, mostly black but a couple red, and my oldest one has been heavily used for about 2 years with no issues. Not bad for $8 shipped.
_________________________
“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman