Are you going to be in the parks every day? If not, you may want to try your character meal on an 'off' day. We are arriving on Sunday afternoon, so our character meal will be the Cinderella Dinner at the GF 1900 Park Fare. That way, on the days we are at the parks we don't have to worry about being at a character meal at a certain time.
Breakfasts are nice, especially if you get them for the time before the park opens. We had the Cinderella Breakfast at the castle on our last trip and it was lovely walking to the castle on main street when the crowds were not there.
I haven't tried Chef Mickey's yet at the Contempory, but would like to do that sometime. That would be a good one for an 'off' day.
If you are going over the holidays, I have heard that the character breakfast at Animal Kingdom has the characters dressed in holiday clothes (but I have not seen it for myself, I just remember someone posting that on this board).
One of our favorite character meals was the ice cream social at the Garden Grill at Epcot. It isn't really a 'meal', but you get a very nice ice cream sundae and the tables are on a rotating floor. The characters come around and visit with each table. We really liked it. I believe it was around 2 or 3:00 in the afternoon. It was a nice break for us.
Have a great trip!
DJ