underglass - 12:54 pm on May 27, 2011 (gmt 0)
Update the original article instead of writing a new one. Pro: has already link juice, age. Con: Blog is not updated
I think this is your best best.
It seems like if you have new information and you are updating the original article, then your Con is eliminated: The blog is updated. Can you change your blog date to reflect the update?