Deluxe bus service from Atlanta to Mexico City?

I am taking a bus from Atlanta to Mexico City and I would like to take a deluxe or first class bus there. I know that there are several buses that leaves from Atlanta or Houston to Mexico, but I am having trouble finding a first class bus to take. My reason for wanting a first class bus is for internet, comfort, and safety. Any suggestions? Also, would you have a phone number or web address of any companies that would have that? Please exclude Greyhound (said they do not have first class buses) and Grupo Senda (provides services from the US but not US contact phone number).