Last year I had 12 lawns and had my 32 walk behind, and this year I have 22 lawns and I an gaining more and more everyday. My question is I think I need a bigger mower. Most of my lawns are 1/2 to 1 acre and are mostly wide open. Should I get a bigger walk behind or should I get a ZTR? what size? Either one I buy I am going to go with an Exmark. Also if you have any other sugestions please let me know.