Some good suggestions...we've never done Kona for breakfast, but that is because we love it so much for an early dinner. Gotta' love that dessert with the cotton candy clouds!
We really enjoyed breakfast at the Pepper Market. In the real world, I hate mall-type food courts, but PM was so much better. We all agreed it was great because the food was quality, and yet overall it was pretty quick too. Plus, I kinda like seeing my breakfast prepared, because I'm a little picky about my eggs, and there I could ask the chef directly to cook my eggs a little longer.
The Boardwalk Bakery was kind of fun because it was nice to be on the Boardwalk, but the food selection is a little limited, and if you go just before Epcot opens, expect a small crowd.
Another of our favorites is the Crystal Palace. The room is cheery in the morning; you get the characters, good food, and if you go for a late breakfast, you won't need to eat lunch. Plus, you're already in the park - if you choose an early breakfast time, then it's a great way to motivate everyone to get up and out quickly.