Gentlemen,
thank you for your attention and feedback. I am still hashing over the 9000 vs 999 debate. I have, though, found two opposing answers to my original question: Of the two, which is better for 2-channel audio?
Joel Brinkley, in the January 2003 edition of Ultiamate AV, had this to say in his review of the 999: "At the moment, I have two copies of only one SACD: Yo-Yo Ma's Solo (Sony Classical SS 64114), a superb 2-channel recording. I was able to perform a direct A/B comparison using my two copies played through different analog inputs of my Lexicon MC-12B processor. When I did this earlier this year, comparing the S9000ES with Sony's DVP-NS900V, I could detect no significant difference between the players. This time, comparing the S9000ES with the NS999ES, there were greater differences. The solo cello sounded a bit more open and clean, a little richer from the NS999ES. The difference was subtle, but it was there."
The link to that review is the following
http://ultimateavmag.com/dvdplayers/84/
On the other hand, Shane Buettner reports in his review of the 999 in the Feb/March 2003 issue of The Absolute Sound (Issue 140, pp. 57-59) that, "good as the [999] is though, it did not quite equal the performance of its predecessor, the Sony DVP-S9000ES, with virtually all two-channel audio formats: SACD, CDs, and 24/96 DADs. The DVP-S9000ES was more open and extended on top, had fuller bass that made the DVP-NS999ES sound a bit lean in comparison. The DVP-S9000ES was also slightly more transparent, with better resolution of low-level details and more soundstage depth" (p. 59).
I wonder if the 999 still had some breaking-in to do....?
So... I will probably go for the 9000, use it as is for a while, and possibly research the world of modifications at a later date. I might be happy with the 9000 as it is. I'm curious to hear how the 9000 combines with the Musical Fidelity X10-D in the signal chain to my preamp. The X10-D warmed up/filled out the sound of my cheapo players.
If I have anyhing of import to say, I'll get back on this chain.
Thanks again.
Marc