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One of the Avid Shorty 4s that came stock on my bike several years ago has given up the ghost. Apart from my love affair with my Clement PDXs, I am not a gear head. I am a bit bewildered by the array of choices out there now. So, I'm coping out and looking for recommendations. Desired features: relatively strong stopping power (off season my 'cross bike gets a lot of use on the road, including mo…