Here are my lower-cost favorites:
Sci-Fi Dine-In: stick with burgers, fries, and shakes and you'll save money and get the best food they offer, IMO. The atmosphere is fun and unique.
'Ohana Breakfast: if you want characters and a good family-style meal this is great, plus it is a lower price than other character experiences.
Sanaa: That bread service is out of this world delicious! It is one of my favorite things to eat at WDW. My family of 4 shared a bread service with extra Naan, the grilled meat trio, a scallop appetizer, and a salad sampler. We were stuffed and the bill wasn't terrible.