A lot has been written about the changes to Medicare, and proposed changes yet to come, so it's no surprise that so many Arizona seniors are confused about their choices. One of the most common questions in this state is, "How do I choose a Part D plan?" According to a recent article from the Tucson Citizen, "Medicare Part D: So many choices!" (October 16, 2012), a study by Health Affairs revealed that seniors overspend on prescription drug plans by more than $368 per year. The reason for this is that they pay for more coverage than they need. In…