There are dozens of wonderful, relatively reasonable restaurants on Disney property! It's impossible to make a legitimate recommendation without more information.
How many people are in your group? What kind of food do you enjoy? Is there anything you can't or won't eat? Do you prefer traditional table service or a buffet? Would you like to dine with characters or not? Are you limited to the theme parks, or are you considering eating at a resort or Downtown Disney?
With a little help, it will be easier to narrow the list of potential places!