I get the sense based on limited experience that the food at character meals isn't as high quality as the food at other buffets, which in turn might not be as good as non-buffet restaurants. For a buffet though I would choose Boma at Animal Kingdom. We did not care for the character breakfast buffet at Crystal Palace or the dinner buffet at Cape May.
For 1 credit table service restaurants I would consider Teppan Edo, Via Napoli and Chefs de France (Epcot), Mama Melrose w/Fantasmic package (Hollywood Studios), and Be Our Guest (Magic Kingdom). Resort/Disney Springs restaurants that we enjoyed most were The Wave, 'Ohana, and Raglan Road. We found that those restaurants all tend to have good food and are pretty consistent. We will not go back to Crystal Palace, Cape May or Rose & Crown. San Angel Inn falls in the middle - great atmosphere and some good food but some not-so-good food.
For an 8 night stay you might consider doing one signature restaurant (which means you'd have to pay out of pocket for one other dinner). If you do, our favorites are Narcoossee's and Yachtsman. The best use of a quick service credit is at Wolfgang Puck Marketplace.
By the way, one point of disagreement with a post above - I would not book a late breakfast since the "prime" touring time for us is park open until around 11:00 when the parks start getting busy. We will do early lunches starting around 11:30 though, but if we make lunch reservations they are at a park we intend to tour at that morning.