Thanks, Gonk. I think I now have most of my questions answered. If I understand this correctly, the 970/990 will give me the capabilities of using the audio sync features if I use HDMI-DVI cables from cable box/dvd player with HDMI outs, or component cables if I use the component out.
If there is no signal degradation from using an HDMI to DVI cable, why do some folks feel it is so important to get HDMI? I feel like I must be missing something.
Finally, have you compared the video between source directly connected to a TV and a source connected to the 970/990 then to a TV?