Voodoochile...Am I correct that a "Redbook CD" is just a particular brand of CD having superior audio mastering? No different digital coding scheme?
I believe that the Pioneer, and for that matter, all other DVD players, have 24 bit 96Kc D/As, (six of them which is why prices are plumeting). CD playback inevitably benefits from DVD playback requirements. I bet that an inexpensive new-technology DVD player performs as well as an expensive outboard D/A from just a few years ago. I'm sure that the analog output circuits of inexpensive DVD players could be improved, (although today's OP amps are much better than the old days) but I bet that deep down inside the digital guts, inexpensive and high end players use the same chip sets.
Also, when playing multichannel DVD-A or any SACD there is no digital output...you MUST use the player's analog outputs.
When I play a CD I can use the digital (optical)output into my decent Rotel D/A, but to tell the truth, the analog signals sound just the same. If there is a difference it is small, whereas the difference between a CD and a SACD is marked. So my advice, based on experience, is make the big jump to the new media quickly and inexpensively, and tweek things up, at great expense, later.