We are consideringa Kubota ZD18 - it's a 2000 with 358 hours (low???) It has 54 deck. We currently have a 2008 BX 2350 and thought that a 60"mid-mount might do just as well. My son has a small mowing business - 14 acres and one of contracts is a cemetery with 190 headstones. We are looking for efficiency and wonder about your thoughths on either or both of above solutions?