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If the dark male catches your eye, go with it. With a dark male, you will obviously get dark chicks of both sexes(provided you have some dark hens). Over light hens he should produce chicks closer to a light pattern in both sexes. Over buff hens should produce pullets that are closer to a light, while the males will have some buff bleeding through.
A buff male over dark hens should produce pullets closer to buffs, males should also be closer to the columbian pattern of lights and buffs and somewhere between in base color of silver(white) with buff showing. Over light hens,buff pullets, and again blended cockerels.
A light male over dark hens should produce closer to light pullets and cockerels. Over a buff hen, light pullets, and blended cockerels.
So your dark male will get you dark, and near light pullets. The other two will basically only produce pullets similiar to themselves. The cockerels when mixing silver and buff will all be mixed, the pullets should look true to the color of their sire. Now this projection is based on the parent stock being of relatively pure breeding, if not your mileage may vary.