What dates are you going? If your going down during F&W, I would say not to do any reservations and just walk around to all the kiosks. You get a little taste of everything that way. If your not going to F&W or your set on having a reservation, Epcot definitely makes it hard to choose. It's the park to be in when it comes to food... I really enjoy any of the restaurants in Italy. I also really enjoy Nine Dragons if you like Chinese (it also makes a great viewing spot for the fireworks). The only place I've really not liked in Epcot was Coral Reef. While the fish tank is really awesome to look at, the service and food were awful.
Those are my 2 cents, let us know what you decide on and have a great trip!