here are some comments from the SD folks on the A/D chip in the V3 vs the 722/744T, taken from the SD support forum. Of course, the A/D chip itself is only part of the story, implementation has a lot to do with how things eventually sound, but I thought it was interesting:
>The V3 uses a PCM1804 from TI, and the 744 uses a CS5361. As a side note - we started this design with the 1804, but it turned out to be such a poor chip in almost every regard, we sold them all back to TI and switched to the much better, cleaner 5361. It is quieter, lower distortion, lower group delay, draws less current, has MUCH better anti-aliasing at higher sample rates, and has no idle tones, and most importantly, sounds much better.<
FWIW.
Steve