I'm from south NJ and what I miss the most is the great bread. Jersey Mike's has the best bread over any other sandwich shops I've been to in Arizona and makes me feel like I am back east. I recommend the white over the wheat personally.
I am a big fan of their hoagies and especially the roast beef and turkey sandwich with bacon. Also their cheesesteak is very good. I haven't had the tuna yet, but my friend has and he loved it. Very delicious food here and I haven't been disappointed yet!