Aside from Surefire, are there other fairly bright, around 100 lumen LED flashlights that are durable (shock resistant, long life, water resistant), but less thant $50?
Streamlight also has a good reputation - some models ( PolyPro ) are popular for industrial use - but most of the PolyPro are a bit less throw on paper than you want - they also have some other ones that are nylon and resistant to water.
Another Fenix recommendation. I have dropped mine on concrete, asphalt and ceramic tile - Not only do they continue to work, but you can't even see any evidence of them having been dropped. They are VERY rugged lights.