I hate raining on anyones parade, but it is a message board - and you did ask

The Garden Grill(supper)- this to me is one of the worst meals in the world. The character interaction is good, so if that is important to you- then this might be a good pick. Personally, i think the food here is beyond bland and there are just so many better options in Epcot. I noticed you have chef mickey so you will get to see him there (but the interaction will be better here most likely). I would choose one of these and not do both.
Le Cellier (Lunch)- it's a fine lunch. You will most likely enjoy.
Hollywood and Vine(Supper)- i have never done dinner. I have done breakfast with the characters and it was fine. Lunch was probably another one that made the list of the worst places in disney i have dined. However, if you are set on doing the fantasmic package, i am sure it will be fine for what it is.
Tusker House(Breakfast)- i really like tusker house. Personally, i like the flavors for lunch better just for a change of pace. But overall, great choice.
Crystal Palace(Breakfast)- a must do for us- the french toast puffs are my favorite.
Chef Mickey's(supper)- eh, but i think we probably differ in the sense i am not huge into buffets. Once again, i guess it is fine for what it is, but would you consider doing the Wave or something like that if you want to be at the contemporary, or Kona? Like i said, very similar to garden grille.
Planet Hollywood(supper) - another one that i would pass in the sense it is nothing special, but if you have the coupon, i know where you are coming from. Personally if i were at DTD, i would go to Raglan, Bongos or Wolfgang Puck
The Plaza(supper)- great little place for burgers, and sandwiches. Slow service, but sometimes that is a nice thing after a day of rushing. Great icecream desserts.
1900 Park Fare(supper= never done. Good luck!