Storytellers is only for breakfast. We did it. It was fun. Chip & Dale, Mickey, and Br'er Bear were the only ones there. Maybe Goofy, too. I can't remember.
Ariel's Grotto is quite good. Food is fixed price, includes soup or salad, drinks and dessert w/ entree of your choice, and a little expensive. But they have gobs of characters running around--I think we met 9 or 10 in one sitting.
Goofy's Kitchen is too expensive (at least for dinner). This is your only option for character meal dinner at a resort hotel/outside of the parks. The food isn't really that good, not in comparison to WDW dinner buffets. And there wasn't as many characters. But they did have some odd ones on hand. Aside from Goofy, Mickey & Pluto, we met Mulan and Rafiki.
They also do a Mickey and friends lunch and dinner at either the Plaza Inn or Plaza Pavillion (can't remember the name). It is the buffeteria at the hub near the entrance to Tomorrowland. We haven't tried it, but saw people eating and interacting during our last few visits. AND the same buffeteria also was recently doing a Princess breakfast (but I'm not sure if it continued after 5-5-05).
Hope this helps.