How cool.
Don't underestimate Epcot. Our kids LOVE Epcot...and the worst advice anyone gave us was to only schedule only one day there because they'd be bored.
Make sure you ride Rockin Roller coaster and Expedition Everest (on EE try the front and the back - 2 very different experiences
)
Are you going to try for any dining reservations? If so, we love Boma! at the Animal Kingdom Lodge. We also love the Fish and Chips in England at Epcot.
If you're looking for a good guide book try the Passporter's Walt Disney World. It reviews everything...counter service, sit-down dining, rides, etc. We kept it in our backpack for our first trip so we could reference it on the go.
I'm sure I'll think of more, but I'm just starting my first cup of coffee.
swanie