I picked up a DVP-NC555ES and I'm posting about it in this forum because it's main use will be CD & SACD playback. I still have my much modded DVP-S7000, but it doesn't have SACD capability. I selected this unit because it had a very reasonable cost for an ES series component with SACD capability. Those Sony CD/SACD units are still in big demand and still expensive.
I opened it up and saw a few similarities to my DVP-S7000. They both have separate audio circuit boards and power supplies for the analog section. They both are very well built and heavy. The DVP-NC555ES has the benefit of already having high grade capacitors in stock form, but there are things that can be upgraded for even better performance. It'll be fun to hear just how good the 'NC555ES gets after a little tweaking.
If anybody's interested, I can post a gut shot later.