Thanks, all. I took delivery of the RX7320.
Honest first impression was it was too big for work in the woods, but after a few hours I seem to have worked out a groove. I do need to trim some low-hanging branches, though. I intend to mostly stick to the trail (actually, a road) and work from there with a winch and grapple.
I like the powershuttle, especially compared to my old manual tractor. The HST on the NX series was nice, but for some reason I just felt better with the powershuttle. I think it's because the HST bogged down a bit when I was test driving it - I know that is controllable by the operator. But for dragging large and heavy logs up a hill both ways, I think the RX is a better machine, even if is not a better fit. Everything is a compromise.
Thanks again, all.