MK - We had a really great meal last visit at El Pirata y El Peroto, or whatever it's really called, in Adventureland. It's Mexican fast food, but was really fresh and had a great toppings bar.
Epcot - Sunshine Seasons is a neat CS. There's lots of options, such an asian section, salads, sandwiches, etc. The desserts are yummy.
DHS- to be honest, we only ate at ABC and we didn't care for it. So I really can't be any help.
AK - our favorite CS-Yak and Yeti CS. Asian food. So good.