I carry a Canon 7D with me on the slopes some days.
- Keep it simple. I bring one lens with me (85mm f/1.8) which means I never have a reason to open up the camera body.
- A fixed focal length lens means less moving parts. A fast prime means I can still get action shots on overcast days.
-Take it easy. DSLR days are the days that I don't push the envelope too hard.
If you bring your camera out enough, you will get condensation inside the lens and maybe on the mirror. I have had this happen to me in alpine conditions on the hill and also tropical conditions on an island in the Atlantic.