Kubota is a good mower but Just because it more expensive doesn't make it a better mower, and your right there built like a tank the problem is they also weigh as much as a tank. The normal 60" mower (Toro Z-Master 5000 / 60") is going to tip the scales at around 1200lbs the ZG series Kubota goes around 1700lbs. Kubota is like the JD they make some great farm equipment but there mowers fall way short IMO.
The OP, user dude, must not be interested enough to reply and answer some questions so we can assist:0)
I'm with you Ric, for the money I'd buy a Toro Z-Master 2000 or 3000 series commercial(or a Gravely Pro-Turn or Pro-Turn 100XDZ) before I'd spend more on a Kubota. But, don't try arguing with user jekjr, as I have found that he doesn't rate anything else on the market to be equal to a Kubota. They are indeed good machines, but IMHO not the best bang-for-your-buck.