I really love Nine Dragons, I've gone to times that the food was amazing and I've gone other times when it's been kind of iffy. A lot of people love Coral Reef, but that's only if you're a big seafood fan and I'm not sure how much the kids would like that. I also ate in Rose and Crown last time and found it was a lot better than expected! (Granted, I didn't terribly high expectations.)
There's a lot of diversity in the restaurants at Epcot, though, so a lot would depend on what type of food you're looking for. Any allergies in the party? Anything to stay away from, for example, nowhere where the food would be too spicy? Things like that could really change the list of suggestions