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If you like 175, go with it. In my experience, the longer crankset causes more hip range of motion. On hard or long rides, that can cause soreness, particularly if you don't stretch your upper legs and hips frequently. Otherwise, I remember Sheldon Brown offering convincing arguments that the "leverage" one would intuitive get from a longer lever arm (crank) is not true. He and I discussed this and he did somewhat agree that it is possible to get the leverage from a longer crank when out of the saddle, but not in it. I don't know. And, the old argument was that a shorter crank arm allowed you to spin more, while a longer crank arm was for someone who like to grind in a lower RPM. We're talking about 1/2 cm of course, which isn't much in the grand scheme of things.
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