The tv-tuner one. Because 830=2x3.0ghz and 820=2x2.8ghz. But i do believe that both contains a tv-tuner.
I want to use my new pc to record tv shows, burn cd's and dvd's, digital photography and eventually video. I'm seriuously considering buying this package (17'' LCD, Canon printer)which doesn't have a TV tuner/remote for $999: