J5, glad my post was able to help. I'm going to try and answer all your questions...let me know if I miss anything.
There are no 3D options I'm aware of on ATI's control panel. There is one for 3D depth on powerdvd but I think that only applies for 2D upconversion to 3D which I dont care about cuz it does not look good to me....rather watch the 2D movie.
I figured out my shadow detail problem. I had to adjust the video picture settings on the ATI control panel instead of letting pdvd do it. By adjusting the brightness and contrast, I was able to get the same shadow detail as the nvidia.
As for connecting it to the 1.3 onkyo, it was the exact opposite of the Nvidia. The nvidia only worked for me when I connected hdmi to projector and dvi/hdmi to receiver. For the 6850, it is the other way around. I did have a weird random bug today when I powered down my system and back up. I could not get the sound to work. The fix after about an hour of troubleshooting was to go to sound under control panel, locate the AMD HDMI sound and double click and then go to level. Somehow my hdmi out was set to 0, changed it back to 100 and all works again.
I was also able to get the desktop to be on 1080 60 and switch to 1080 24fp for 3D and maintain the scaling on the ATI control panel. The fix was to set the desktop to 1080 60 and then scale to desired size on ATI control panel. After that, switch desktop to 1080 24 and then do the same scaling. Now switch back to 1080 60 and when it switches to 1080 24fp for 3D movies, it will maintain the same picture size.
Lastly, I did some more testing on 3D ghosting. I'm 100% that under the sea 3D looks much better on the 6850 then Nvidia 460. I cannot say for certain with Despicable Me or others. I rewatched some of despicable me and still noticed ghosting but if my memory serves me correctly, it seemed less. I also watched space station in 3D for the first time, noticed some ghosting. Since I did not watch it on the 460, I cannot say if it was better or not. Net net, I still think it is better and remain hopeful that future drivers will improve ghosting even more.
I'll probably hang onto the 460 just in case Nvidia release drivers that certifies the RS40 as an approved projector. I just want the least amount of ghosting without having to go up to the RS50