be careful on the new cub cadets as they have been bought out by MTD and have been cheapened, I was looking at getting one of their tracked models this spring for this year and from my research it wasn't worth it.Good to know. One of my colleagues is a big cub cadet fan so was going to look at that in addition to some of the ones you list.
FWIW Consumer Reports rated the Cub Cadet 2X 30" HP their best buy. Their high rated models are littered between Cub Cadet, Toro, Ariens, and Troy Built.
more like Cashiers Reports.

