panchopantera, to get more HD channels, you need --- more dishes! If you currently have only one dish installed, you are looking at the 101 satellite. There is only one LA HD network on that satellite, CBS.
On the 119 satellite, you have the other 3 HD networks, plus Discovery and ESPN HD.
On the 110 satellite, there are a few more HD channels, like HBO, Showtime, HDNet, and others.
To be able to receive all three satellites, you will need 3 separate dishes (if you are south of the border, that is), a special 2-satellite 22khz multiswitch, and a SatC integration kit.
If you are close enough to the US (either north or south) that you don't need a larger dish, the PhaseIII dish will get all 3 satellites, avoiding the 3-dish hassle.