This question really depends on what type of eaters you have in your family. I would recommend either one of the character breakfasts or the San Angel Inn dinner for your out of pocket meal. The breakfasts are buffets and will cost you around $30 per adult for Crystal Palace and around $33 per adult for the Garden Grill. The only problem with the breakfasts is that since they are both all you care to enjoy, you will have to pay for each member of your party. If you have lighter eaters in your family, San Angel dinner entrees range between $25 - $30 each, and you might be able to get away with splitting entrees or just ordering a variety of appetizers for your party to share, cutting down on the costs. Keep in mind though, at San Angel you will have to pay for your entree, drink, and dessert which can end up costing more than either of the character breakfasts (for example, if you get the carne assada entree it's $30, dessert is $8 and a soft drink at the table service restaurants in Epcot tends to be around $3, so you're looking at around $41, not including tax and tip).
Have fun with the character meals! I love character meals and tend to do at least 4 each trip. The character interaction at The Garden Grill is phenomenal!