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Hi folks

I'v just upgraded my camera from a 400d to a 50d and I'm thinking it might be time to change my main use lens. Right now i'v got the 28-135mm but i'm not overly impressed with the sharpness of it, and the lens creep drives me mad. I'm considering selling it on and going for one of the shorter EF-S versions. Is the 17-85 an improvement over the 28-135? And is the 15-85 worth paying almost twice as much for than the 17-85. I'v no plans to get a full frame camera anytime soon, unless the 6D price drops massively.

Thanks