I am thinking about upgrading my 510. Is there any difference if I do it with Dish vs a local retailer? Can local retailers upgrade my 510 to a 622? Also I have the current setup looking at 110/119/148 so If I want all the HD channels I need 110/119/129 right? Is the extran dish already included in the $299 upfront fee? Also my DVR was just replaced recently as my previous one died. I understand thea they have some limits on the Dishin it up. Is that going to prevent me from getting a 622. Thanks in advance