Cafe Rix is actually a great grab and go option. They do have breakfast sandwiches, fruit, yogurt, pastries, etc.
I'm not familiar with the $15 breakfast buffet at Pepper Market, but unless they changed their menu within the last year you can order a variety of breakfast plates in the $10 range. They had all the traditional breakfast foods: eggs, bacon, sausage, biscuits, waffles, omelets, breakfast burritos, etc. We thought it was good, but the Cafe Rix was usually more convenient when you are trying to get out the door and to the parks.
Sept 2009- AKL (30th b-day trip)
Sept 2010- BCV (baby's 1st trip)
Oct 2011- WLV
May 2012- Boardwalk
Dec 2012- Saratoga
Feb 2014- Bay Lake Tower(baby's 1st trip)