We had breakfast and lunch at the Crystal Palace in MK, and it was great! The restaurant itself is really pretty, and the buffet was very tasty. And of course how can you not enjoy Pooh, Piglet, Eeyore, and Tigger!
Also, Cape May has a really great dinner buffet, and I've heard breakfast there is good too. You can check out menus at wdwig.com. Good luck, and enjoy!