I just went today (after trying to go in September only to discover they were closed for a month, boo!) and had their #6 based off of recommendations from this page.
Absofrickinglutely delicious and I was kicking myself for not getting a second sandwich. The grilled pork was delicious but the pickled vegetables and cilantro were really what made the sandwich, A word of warning: the bread is really crusty (in a good way) so be careful if you're going to eat in your car. I was covered in crumbs when I got back out! ;)