I love Ohana & Kona Cafe - two of my favorite places in WDW. Kona is my number one, because I prefer ordering off a menu over family style foods. I also am not a huge eater, and Ohana tends to be too much food for me. But DH pushes for Ohana, so we take turns. Kona's coconut chicken or Pan Asian noodles are both amazing. I love the noodles, bread & dessert at Ohana. I don't think you can go wrong either way. Going there & getting a drink, and watching Wishes after is a tradition for us - I highly recommend it!
As far as allergies go, Disney is really great about accommodating everyone. When you call to make ADR's or make them online, just include your allergy information. Confirm it when you check in to the restaurant as well, and they will work something out for you. When I was pregnant and couldn't eat soft cheeses, and was nauseated by so many things, the chefs were awesome about creating other things for me.