Why don't you visit underwoodhifi.com and look at the audio signal path mods available? It's possible to improve all three technically. Also, of course you know that HD-DVD/Blu-Ray audio and video is not decodable by any of these players. A future consideration. Lastly, the video quality of these players is not equal but the differences are based on connection and source material cadence types. Detailed evals are on the home theater secrets DVD shootout web pages. The 3910 has some minor image cropping issues over component cabling for instance that the 5910 does not. Just one example.
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