Alot of the channels are being broadcast in both SD and HD so
hopefully the ones you like will have an HD channel as well.
By sending the signal through hdmi the signal remains digital
so less processing is involved which helps improve picture
quality. Right now you receiving a digital signal, it's being
converted to analog to send over your composite cable. It's
best to stay digital all the way.
I just bought a new Samsung 40" full HD LCD TV but I am not getting the "supposedly" nice and clear decent pictures when viewing normal satellite channels on the screen comparing to my 4-5 years old TV!!!). I'm using normal digital receiver with normal composite cable.
If I purchase HDMI satellite receiver with HDMI cable but still viewing normal channels, would I be able to view better pictures at all?? Note that when I connect the PC to the TV and watch a high resolution movie, I get very nice output.