I've been happily watching my HD Sony set with my digital cable for almost a year now and I'm once again asking myself if it's time to get some actual HD signals. The questions are: Are the HD receivers out there now good enough, and has a standard finally emerged? Is there enough HD programming out there yet to make it worth the $$ to buy the receiver and whatever else I need. Aside from a receiver, what else do I need? Thanks in advance for any input.