You are right that your 17-85 isn't compatible with a mkIII and also that you could damage the mirror by trying it. The lens can be modified to work on your camera, but I wouldn't recommend it, you'd get strong vingetting at the wide end. The obvious lens to suggest isn't a cheap one... I'd look for a Canon 24-105 f4 IS. A friend uses one on a mkIII for protrait work and gets outstanding results.
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