From my research before I traded the 3910 in on a 5910CI is that the 5900 has a better audio section. And they both are equivalant in video. You can download the specs and manuals at Denon.com and pull up the 5900 in archives.
Kr4, yes the 5910 is much more machine than the 3910. I traded the 3910 in on the 5910CI. The 5910CI was also capable of the 1080P, if I can only find the right TV now. But I beleive the 5900 and 3910 are pretty much the same with a few improvements in audio.
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