We did a lot of research when we got married because of the minimum prices Disney required and we thought we were having a smallish group (thought we'd have about 30-35, ended up being 70 and ended up doing a real reception with Disney).
That said, Wolfgang Puck's has a beautiful upstairs dining room you might be able to get just for your group depending on the time of day you want to eat there and Fulton's Crab House has some private dining areas as well. Another option might be Palio at The Swan. Fantastic food and we've only ever had great service there. I bet they'd do a very nice job, too!
For some other Disney options, I'm not sure if you'd want to go into a park, but the Hollywood Brown Derby has a great little private dining room, but I'm not sure how many they could seat in there. We LOVE the food there, and I'm sure they could do the menus for you because they do them for the Imagineer lunches. And California Grill has two private dining areas -- the glassed-in one toward the back of the restaurant may be too small, but there's a larger room with the partial MK view which would definitely work.
Good luck with all the planning!