Sony SCD-777ES, Oppo UPD-205 or Marantz SA-KI Ruby

My UDP-205 is the Modwright customized version with a separate single-tube power supply and twin-tube audio output. I'm happy as can be with it but haven't listened to the other players mentioned.

This may be a stupid question: have you made the appropriate adjustments in the Audio Processing Setup and the Speaker Configuration, as found in the User Manual?

If the answer is no, then you haven't really experienced the sound it's capable of delivering. 

There is even a Crossover frequency Bass Management adjustment for all speakers that I find can make a difference from one recording to another. The default is 80Hz.

I’ve heard the ruby player a few times and it just sits at my dealers. The SA 10 is the one you want. Of course, YMMV.

I too, have a 105. Mine is moded with Furutec IEC with solid silver tail to the board, 110/220 jumper to bypass the switch, and replaced the OEM PS with a linear power supply. These significantly improved the sound, but the transport really holds the 105 back. This is on my next replacement list hth

Instead of a Marantz Ruby, how about the Luxman D03X at $3500 or the ultimate Luxman D10X at $16,000 (discounted some places).  

Thank you for the comments.  I am not going Marantz SA-KI Ruby based on above.  As you have pointed out there are other choices.   Marantz Holy Grail is the SA-10, not the Ruby.  The $ 1,000 discount may be due to move units sitting in boxes.  I have not decided on my next step.  

Your comments and input were superb.