I've recently been approved by wife to upgrade our lawn mower (craftsman 42") to a zero turn. I currently mow 2 acres and need something to speed up the process. I was looking at a ZD1211 60" due to the fact it's diesel, shaft drive, etc, and I want something that will last me a long time. The issue is its $13,500 new, but they have 0% financing available. They do have a 2010 Kubota ZD326S-60 with 640hrs. My question is are there any items I should be cautious of and any wear items before I pursue? Is 640 hours a lot for this mower? Thank you!