Ok guys I need help deciding what type of mower to get for my lot. It's 1.5 acres of flat grass with a fair amount of trees. I currently have a 36 inch scag hydro walk behind and I like the mower but its just taking me to long to mow the open areas of this yard. Should I just get a bigger walk behind or should I get a stander or ztr? What are the benefits to the stander over the ztr and walkbehind?