I'm in the market for a new machine. It will be an Exmark. I've narrowed it down to Lazer Z HP 23 hp Kaw. 52" or Lazer Z 23 hp Kaw. 60" or the Lazer Z liquid cooled 23 hp Kaw. 60" My question is, will the 23 hp Kawasaki handle the 60" deck? What are the advantages of the liquid cooled over the air cooled? What are the major differences between the HP's and the Z's besides about $700? I usually run two machines and only put around 400 hrs per year on the machine.