Another vote for Starring Rolls, but do be aware that the sandwiches often run out by mid-afternoon, and I think the location closes completely around 4 pm.
I think the sandwiches are better than any of the other food options in DHS, though, and the dessert selection cannot be beat. If you are on a dining plan it is 1 CS credit and you get a sandwich, your choice of side item (a bag of chips or a piece of fresh fruit), a large fountain drink, AND your choice of desserts including any one of several huge cupcakes. The Butterfinger cupcake is good and the Red Velvet is awesome. There's a whole thread in this forum with cupcake pics; check it out.