I am in the same search function for my Glock 22. The slide is currently in the process of getting a CGW CenTac9H finish in satin silver.
I have a Surefire X200A and I assume the X300 is built to the same toughness because my X200A has been through heck and back. At last count (or well lost count) it has had over 5000 rounds through it (of various calibers), been shot off two seperate guns (once by me for not fully mounting it and the same for someone else who was trying it out), been dropped, thrown, and just generally used hard. Everytime I switch it on, it still works.
I am awaiting the release of the X300L/X400 (X300 with laser.) I currently have a Surefire P101 (uses the P60/P61 or P60L lamp assemblies and is about 2X bigger than the X200/300 series and needs a seperate rail mounted to the Glock, so I will most likely just keep it in my locker as a momento because performance and size at this current time sucks...Most likely due to the shock isolation with the incandescent bulbs.
Surefire has discontinued all their incandescent pistol lights and concentrated on the X300 series.
The TLR-1 and TLR-2 are also contenders but I have not had the time to test them (or haven't came across one at a deal.) I know it is not as on/off as easily as the X200/X300 but it comes close (there is a screw that needs to be tightened on it.)
There are the older Insight/Streamlight M3, M3X, M6, and M6X series incandescent lights that preceded the TLR-1 and TLR-2. They seem to be pretty popular still. I have tried out the M6 for a few days and I just didn't like it.
Here is a picture of the X200A burned front due to shorter barrel lengths.
Here is the X200 on my Glock 19
Here is a Surefire P101 for size comparison with my Glock 19
If you want a picture of the X200 on a Glock 22, I might be heading up to the shop later tonight and can snap a few for you with the light mounted. Just send me a PM here.