Just a quick update to my earlier posts about a new mower after my LA135 transmission started playing up. I got a good price on the LA135, so I've ordered the X590 with the 54" deck and brush guard. The dealer chucked in everything I need for the first service, a JD hat, plus delivery. I thought that was pretty good since he's 1.5 hours from my place. It ended up being $13800, which was a couple of thousand cheaper than the local shop, and they still wanted to bill me for delivery. That said, I've always followed the view that if you buy the best you only cry once, so I figure that once I go the X590 it'll be lasting me a lot longer than just getting something like the LA135 again. That plus the 1025R will give me pretty flexible options around the yard.
It's a 3 month wait to get one out from the US as there's none in Australia at the moment. I saw an X570 though sitting next to a D series, so I could see the frame etc are a clear upgrade over a normal lawn mower. It was quite impressive, and I think with the hydraulic steering and lift, my kids can start to help with the mowing when they get a little older. The LA135 is a bit of a workout, so if the steering is like the 1025R it'll be great.
Thanks everyone for their input, it helped me make the decision. I'll post again once I get my hands on it. I just mowed for probably the last time now with the LA135 as we're coming into winter and the grass has stopped growing. Now the wait...