Here's a paper comparison. The 3910 will have a better deinterlacer, will have a better layer change delay (essentially none), and will have better bass management for SACD & DVD-A than the 59AVi. The 3910 also has seemingly better build quality (18.7 vs 12.1 lbs). I also think I saw somewhere that the 3910 has better DACs too (both Burr Browns, but different model numbers). But who knows how all of that will end up in a real world audio and video comparison? But I suspect I know...
