What's the best Sony CD/SACD player?


Hi all, there's been a bunch of talk lately about Sony's latest 5400ES SACD player. I have a 9100ES DVD player I use for both video and audio. What are peoples' opinions on the best new or used Sony for CD/SACD sources?

Specifically, what about the new 5400ES, the XA-9000ES, the 777ES, vs my 9100ES? They all seem available for around $1000.00.

What else would people suggest in that price range for 90% RBCD and 10% SACD? The rest of my system is Linn. I'm also thinking about a used Linn Unidisk SC.

Thanks!
bmdduck
Could someone describe the tonal differences between the xa5400es and the dvp9000es which I'm currently using in my bedroom/TV system?

I have no doubt that the 5400es is overall better- my only concern is that I actually like the slight "stridency" of the dvp9000es which may not exist on the 5400es.
I haven't heard DVP, but my XA5400ES does not sound strident. However there is this Sony house sound that I also heard on DAP9000ES preamp as I remember. I wonder if that's what you are referring to. Other than the house sound, it sounds exceptionally neutral and detailed.
Allen,

My DVP-S9000ES had a bit of stridency. When it finally failed to play SACD discs reliably, I sent it to Sony Larado. According to their report, Sony overhauled it and brought it up to specs. Whatever they did, the stridency is gone and it is an improved player. So much so, it replaced a 9100ES in my primary system.

db
I've used a Sony NS999ES for quite some time, primarily for SACD as almost all of my RBCD is ripped to a music server and played via a Squeezebox. RBCD that is played on the Sony goes through an external DAC, but as far as SACD performance goes, the need for a change has been hard to justify!

On the subject of SACD performance, does anyone know if there's ever been any kind of upgrade path for the SACD decoding chips from Sony? They essentially own the technology, right? If they've never changed the decoding chip architecture at all (like has been the case in a myriad number of ways with RBCD chips...), should there really be that much difference in SACD performance amongst Sony players (or any other for that matter?)? I'd imagine there's been changes to things like power supplies, output stages, transports etc., but has Sony ever introduced an "updated" SACD decode chip... just some food for thought and conversation.
How do you tell what kind of SACD decoding chip is used on which model? Unlike other high end manufacturers Sony employs their own custom chipset and AFAIK it's not published anywhere which chips are used.