I'm addicted to the Mermaid Cafe. Their coconut curry aoli sauce totally rocks the Oh Mighty Isis and New Delhi Deli sandwiches and the soups I've tried (caribbean carrot and lentil) are delicious. They have great coffee and baked goods as well if you're just looking for a sugar/caffeine boost.
Also, the staff there are super nice and help contribute to the warm and friendly atmosphere.