My short list...
Siamo Nel Forno - Palermo Hollywood (Its one of the best pizzas I have ever had)
The Burger Joint - Palermo Viejo (very good american style homemade burgers)
Magendie - Palermo Hollywood (Good Selection of Salads, Sandwiches, healthy foods, also they have the best bread in town.)
Poroto - Palermo Hollywood (Good Sandwiches - chicken, veggie, fish, all nice and fresh with a good salad.)