I was looking at this the beginning of the year, and the drawback for me is that PC's don't do 7.1 PCM over HDMI yet.
I guess if you have a 7.1 sound card, you could run eight RCA's from your PC to receiver, but I did not really want to do it, so I was going to wait until they start making video cards that can support HDMI sound.
And, in the end, I'll probably just buy a blu ray player. It's more user friendly for the family than a PC.
Randy