The Ati cards do at least 5.1 (3800 series) - 7.1 (4800) series sound through hdmi. Also the 4800 series can utilize 2 hd signals giving you picture in picture hd. If you decide on the 780g route gigabyte is considered a good choice. I'm currently using a 3850 and picture quality with BD discs and hd tv look great + I can game a little on the 46" lcd
