Good points on Jackson & Van Buren as they are already at a premium. But I'm confused about the Buchanan comment of selling more. If the public were to buy more of JB, there can only be as many sets of the "gang of four" as the one with the lowest mintage. So the worst case would be Jefferson-esque situation. But I doubt Buchanan will have the numbers of a popular Jefferson. And he's still a non-spouse coin, although "that" may raise the mintage. Also gold price may keep numbers lower.