By the time they've batted a few innings, it doesn't really matter who your lead-off hitter is, he only leads off once. Put your best batters as far up the line up as possible so over the long haul so they get the most at bats. I'd go Dozier, Mauer, Sano, Plouffe, Park/Arcia, Rosario, Suzuki, Esocbar, Buxton. Do whats best for Buxton, leave him at the bottom of the order all year, let him gain the confidence of sustained success. He'll have plenty of years to bat lead off. As far as Mauer goes, even a sub-par Mauer is better than most of the other Twins hitters, until that changes, he stays at the top of the line-up.