My top 3 are....
California Grill - Not technically breakfast but their brunch is a sight to behold for both your eyes and stomach
The Wave - Just down a few floors from CG, The Wave has a great and inexpensive breakfast buffet that is smaller than most others which for us = higher quality and fresher food
Ale and Compass - New on the list for us. The service we had was horrible, but it was quickly forgiven for one of the best breakfasts we've ever had on property