Welcome, Murf. No difference from 2016 to present and that milage is as good as new. ES option, (I have it) you WILL use as you get familiar with the bike. Allows for customizing the suspension between highway and twisty's on the fly. No additional maintenance is required for the ES. As for price...... that is always a issue. As I said, besides color, there is really no difference between 2016 and up, so I would guesstimate USD 14k to 16k depending on the slight wear and tear. 16K would be a as new price and I would tend to be nearer the 14k.
2014 GenIII RED ES
2002 RED VTX1800c, she is STILL sweet!