Great topic to consider! Imagining hometown hero Mauer come in and play 9/10 games a year at Target Field for the loathed Tigers (not quite as bad as the Chi-Six, but darn close), coupled with the image of Fielder striking out again (and again) in the ALCS gives me great pause, even before considering the other factors (power, weight, durability, etc.). As long as Mauer's concussions don't cause a problem down the road (still a relatively big "if" to someone who remembers Morneau and Koskie's issues), I can't imagine trading him for anyone except that elite list of 10-12 players (like who Shane Wahl mentioned).