We are certainly more limited here than on the West Coast. At least we are starting to get more chains here though. I've eaten at all of the above. Chipotle is pretty good but they have a more limited menu than Qdoba and they charged extra for guacamole that doesnt taste as good to me. Moe's is ok as well but their ground beef tastes very cheap to me.
Taco bell is the only fast food one while the others are fast causal so its really not in the same class if you ask me. However, most people probably have been to one or have one near them.