We love Boma for both breakfast and dinner, and I can't say I prefer one over the other. However in your case with limited time, I'd pick Boma for breakfast as it's probably in our top two places for breakfast in all of WDW (the other being Homecomin' brunch). Boma dinner is also wonderful, but there are quite a few equally good places to eat dinner - including Jiko, which is what I'd suggest.
So I'd agree with the others:
Breakfast - Boma
Lunch - Sanaa (definitely want to eat there in the daylight)
Dinner - Jiko