I currently have the Hughes HD DirecTV receiver, hooked up to a rooftop antenna for local HD. I don't have a dish or service. I would like to get DirecTV, but I also want a Tivo/UltimateTV setup. What is the best way for me to do this? Get a Tivo/UltimateTV + DirecTV package that includes the standard dish and installation, then buy the HD dish later? Get the HD dish alone, install it myself, then buy a separate Tivo/UltimateTV box? What are the pros/cons of Tivo vs Ultimate TV?