Note: These are mostly places that were recommended to me that I have yet to try. Mostly for my own future-reference Philly Mexican food cravings.
Taqueria La Veracruzana
Zocalo - This one I've eaten at. I consider it to pricey for other than special occasions. The food is very...sophisticated. NOT your standard traditional fare. The corn tortillas are wonderful, hand made on the premises, and they made a few dozen up for me specially to take home when I asked.