I know this is a few months old, but I wanted to throw in my 2 cents worth.
The xj2025 and xj2025h are the new versions, with the tier 4 engine.
The J2023H and J2025H are the previous models and had the tier 3 engines.
I have a J2023H, and I am happy with it. I did a lot of research before buying it, and it is slightly large than most company's entry level tractor, but for the same price, and in some cases less.