Sorry, if I'm adding to the noise, but I would go for the DSLR, too, even if it is bulkier. One of my climbing partners at Seneca always had his slung around his back in a fairly burly case, and the case protected it from long, rocky scrambles upwards to technical 5.8 (sometimes sandbagged) terrain. He still seems pretty comfortable moving around on the wall with it. Even with all the work of climbing and staying safe, he's managed to get some photo gems that definitely wouldn't have been the same quality had he used a point and shoot. I've obliterated a point and shoot when climbing, and I didn't even get any on-route photos with it!
The one thing that I'd worry about with a DSLR is more of an risk of frozen parts. I've had video camera components freeze and lock up because the conditions were really cold. Probably could have avoided that had I not left the camera in my pack's brain... but you said you're doing a summer ascent, so I would guess this problem would be less likely.
All that said, just give it some bomber but manageable packaging (those cases that are more molded to the camera shape) and if things get cold, have the camera in a place where you can keep it warm.
Good luck! Adams sounds like it'll be a blast.