My Wife and I are going to be going through dish network for satelitte. We have been looking at Sat. receivers on Ebay and are noticing some come with a smartcard and some do not. Is there a reason to have one with a smart card? Is there anything I should be worried about such as Card Rom and Div #? What kind of dish should we go with? I have noticed several different kinds. We are just looking for the basic setup....We don't need anything special for HD or DVR. Any information would be greatly appreciated. Thanks