Call your service provider.
You'll definetely need a High Def Cable box aswell... sold from your service provide. I don't know the current prices but I highly recommend the PVR Recorder box.
Yes, HDTV is fantastic. Found myself watching GOLF today just to see how clear the picture was, could see every blade of grass almost.
http://www.shaw.ca/en-ca/ProductsServices/...PVRTerminal.htm