Your list seems pretty complete, but if you are ordering from the factory, I wonder how long it will take for you to get it? On another post, somebody posted that Kubota is saying it's a year wait to get a new tractor from the factory. I signed the purchase order for a new Massey Ferguson 4707 two months ago and I was told it would be 3 to six months before one arrived. And that wasn't anything custom, just their basic model.
Before committing to the Massey, I was positive that I wanted something Tier3, so I was only looking at used tractors. No brand in particular, but I've always thought that Kubota was the standard that the other brands tried to measure up to. I still believe this, but so far, I have never bought a Kubota, but it's where I always start my search and then compare with other brands to see who has more features, or costs less.
My very favorite place to go to look at used tractors with a huge selection of different brands is J & K just South of Tyler on 155 towards Lake Palestine.
https://www.jandksales.net/
What's really great about them is that they have dozens of used tractors in their yard that you can climb into and look over, right next to each other. A few brands really surprised me by how worn out they looked with just a few hundred hours on them. Others surprised me by how nice they where, like Massey. I know that how they where treated is how they looked, but I also feel that some of the wear and tear on them also showed how well they where built.
If you have not committed to a brand yet, and you are in the area, it's worth your time to see what they have just to look at a variety of different brands all at the same time.