I have trouble believing that anyone could go outside of these three players. On the outside edge you might be able to make a case for Carl Crawford but his 2009 season is not really all that far off from his typical performances. Though in the first half it seemed like he might be headed towards a record breaking stolen base total.
Personally, I think it has to be Joe Mauer both for his performance and the price he likely went for in auctions. Albert Pujols cost $40-plus in just about every league, we know at this point that he'll hit for average and 40 homers and what that will cost. Zack Grienke probably was not as expensive but he is also a pitcher who did not collect many wins. Cy Young? Yes. Fantasy Player of the year? Not so certain. Mauer was hurt the first month of the season and had to come at a severe discount in most leagues. My vote is for Mauer.
Who is your pick and why? Let's discuss in the comments.