Mary,
Consider joining Tour Guide Mike's site, as seen on the top of this page in banner form. He goes into gruesome detail, for every day of the year, which parks would be your top, middle, and bottom choices for the day, even differentiating between day and night. As a Disboards member, it's only $18, and considering to cost of a Disney vacation, it was a no-brainer. Having been to Disney 6 times in the last 7 years, on the Disboards for 4 years, reading the unofficial guide each year, etc, I still learned quite a bit from his site. Have a great trip!