Cmach,
I have owned and listened to a Marantz SA-8260 from 2003 to 2020. All the Marantz entry level players were about the same up to and including the SA-8005. They all benefitted from a new analogue output stage. I had my own unique design gathered from diyaudio, and it was very very good. Dan's output stage features a bit of the tube sound and is also very very good.
In July 2020 I bought a Marantz SA KI Ruby player. It took about 3 seconds to determine that this player right out of the box was a huge improvement over the SA-8260. And then it got better the more it played.
I am an sacd guy with 3/4th's of my 2000 disc collection being sacd. And most of those are high rez recordings, not reissues. All of the new generation Marantz players are worth every penny.
So, if you can afford the SA-10 and feel you need the fully balanced output stage, go for it. Otherwise the SACD N30 player offers the same package with a single ended output stage, at a far reduced cost.
Steve