I mentioned this on the 10.5 (Integra) thread, but I'll repeat it here:
I had the chance to compare a 10.5 ($2500) with the 3910 ($1200) in my home theater. I calibrated both units over their digital connections (DVI for the 3910), running digital audio from each to my Casablanca III for processing.
The 3910, to my eyes, had a slighly preferable picture on some content to the 10.5. On other content, it was a dead draw. When the image was better, it was more "film-like" to me, fewer artifacts, slightly better color. Subtle, but definitely there. Given the price difference, and the slight edge in image, the 3910 is the better value and choice for video, in my opinion. Sound was equivalent (as a transport).
Hope that helps! I returned the 10.5 and kept the 3910. Build quality on the 3910 is good, but it's great on the 10.5. Still, you can't have everything, and quality of image is more important to me than heft