Nothing compares to my arepa experience at La Caraquena (Arlington, VA) but that won't stop me from attempting to find a second best option.
Arepa Y Empanada Dona Maria
1315 1st Street E
Humble, TX 77338-5926
green sauce is excellent
cachapas: a sweet corn pancake with a 1/2" slice of cheese nestled in
shredded beef arepa - the arepa itself was grilled perfectly, but the shredded beef was too salty for me
oh and their passion fruit juice was excellent