I ate at the Wave, I chose the buffet and I have to say it was no different than any other breakfast buffet at Disney. I did, however see people ordering plates of food off the menu and it looked great. Grand Fla Cafe I have only eaten dinner at, their french onion soup is the best in any place in the World, even France. I like the ambiance of GFC better.
Have you considered Kona Cafe? To me, they are my fave place for sit down breakfast, Fresh Kona coffee, or pressed pot of coffee, the Tonga Toast or any other breakfast platter is delicious.And the atmosphere is great!