I'd suggst Ohana (Polynesian all-you-can-eat luau), Raglan Road (DTD/DS with uspcale Irish pub fare and live step-dancing in the evening), Be Our Guest (MK in side Beast's castle, and the hottest ticket in the park), Biergarten (Epcot all-you-can-eat German buffet with live music in the afternoon and evening), Via Napoli or Tutto Italia (Epcot's well-regarded Italian restaurants), The Wave (Contemporary), Akershus (Epcot princess meal), and Crystal Palace (MK Pooh characters meal). To maximize value, schedule these meals for dinner, which is the most expensive meal of the day, and will often include menu offerings a tad more upscale than lunch.
Since you're on the dining plan, be aware of which meals (signature restaurants and dinner shows, mainly) are 2-credit meals. A 2-credit meal virtually never costs twice what a good 1-credit TS meal costs and doing one will require you to pay for an additional meal out-of-pocket somewhere, so it is almost always a waste of credits to do a 2-credit TS meal unless you're paying for it out of pocket. That being said, if you're not worried about "maximizing" your TS credit value, consider a 2-credit experience like California Grill at the Contemporary, Jiko at the Animal Kingdom Lodge, the Hollywood Brown Derby in Hollywood Studios or the Hoop-de-Doo Musical Revue at Fort Wilderness Campground.