I'm thinking about purchasing a Hitachi 51SWX set and was hoping you guys can help me out with a couple of basic HDTV ?'s 1. Will I notice a big difference if I switch from regular cable (which I have now) to digital cable? 2. Can I run my cable through an HD receiver for better stretch modes (the one thing I don't like about the Hitachi) on 4:3 broadcasts? 3. Can I receive ota HDTV broadcasts just with an HD receiver or do I also need a HDTV antenna?