I use the Canon Powershot SX230 HS. At 7.87 oz, it's one of the heaviest things I carry! (heavier than my sleeping pad, lol!!) But I LOVE this camera. For me, pictures and videos are extremely important - that's how you remember the trip. This camera has 14X optical zoom, try getting that on an iPhone! It sounds like you want a lighter weight, but I would not use a cell phone as my only camera. IMO the capacity is too limited.
For example, here's a picture I took of some locals jumping off rocks. I was far up a mountain when I saw it, but because of my hella awesome zoom I was able to capture it.
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