I've got several Princeton Remixes of different flavors and they have been great. That said, I'd consider something that has a lock out feature to keep it from coming on in your pack. I know some of the Black Diamond models have that feature and overall seem to be pretty popular.
If you have a screw on cap an easy lockout feature is to unscrew the cap a 1/4 turn. That's what I do with my Zebra lights.