As far as the national menu goes (regional menus may vary), the Big Philly is the non-Regular sub (because it has double meat you see).
Subway is also running an instant-win promotion, Footlong Nation Appreciation, which runs through 3/11/12. You can get codes to enter online on specially marked 30-ounce cups and Doritos Nacho Cheese Chips at your local Subway shop. Prizes include free Footlongs for life. You can check out the official rules here.
