I think the MX5200 you're looking at is the right size for your property and chores you've mentioned already. I had the
L3800 (the predecessor of the
L3901) and it would do everything you mentioned, but if you will be dealing with round bales, I think the MX5200 to be a better size for loader strength. For trail creation and maintenance, I'd recommend that you buy a tooth bar for your loader and buy a box blade (6 or 7') for the tractor. This will add
ballast when using the FEL and will be a great help for trail creation and maintenance. With a tooth bar on your loader, you'll be amazed at how much you can dig/shape/contour with it too. You will need ballast to get the most lift out of your loader, so along with the box blade, I'd also make sure your rear wheels are filled with antifreeze or whatever is used in your climate. It will make a huge difference in stability and lift capacity.
With that size tractor, you can probably run a 7' bush hog (maybe even 8). This will be a stout toy and exactly what I would buy if I were in your shoes.
I'm partial to Kubota, but that said, I would also look at the same size tractor in Kioti, JD (but they suck in my area with pricing), NH, and Yanmar. I'd be comfortable buying any of them. See what fits you best and what ergonomics you prefer amongst them.
Happy tractoring!