There are DVi to HDMI adapters/cables, so all you need to do is get a HDMI/DVI cable and run that to the Denon. I would guess you are already running in a higher display mode on your PC then on your TV so depending on the display settings there may be some adjustments required there.

I am unaware of any PC optical drives that will read SACD, but there are BR players out there for a couple hundred.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70