To get the benefits of my new dvr 722, I need access to three sat's in orbit. My 500 only gets two of them. I think that means I need a new 1000. Will a local installer just sell me the dish 1000 and install it for me (for the cost of labor and the dish of course) or must I do something else? I can also purchase one off the web I suppose and have it installed for me. Thanks.