I am looking at a 65 inch gold plus, platinum or silver plus. The silver plus does not have the built in hdtv receiver, and is the cheapest of the three. My question is: is there any benefit to the built in unit when I am going to buy the directv hd gear anyway to get the satellite hd? I have been looking at the pictures of the backs of the units and the built ins have a firewire connection - would this be useful for a later upgrade of some sort? To sum it all up: does the built in hd receiver do anything other than get network hd out of the air? Thanks for any response.