Here are my thoughts. First, I would start out with a 48" ZTR mower 80% of my residential work. Leaves nice stripes and gets into most new homes that have gated back yards. 2nd, I would get a 33"-36" for a trim mower and small gated back yards. Thirds, I would get a 72" ZTR for wide open acreage. My screw is normally 2 people. On small properties, 1 trimming and blowing and the other on the 48" cutting. Take about 10 minutes. On larger 1 acre+, 1st guy goes on 72" and cuts the back while the 2nd trims and then starts with the 48" in front and then helps out where ever. When done, both blow. Actually, I don't have the 72" yet. I sold my 52" Stander this past fall in order to get a 60 or 72 this spring. I'm still desciding to get a 60 or 72 mower. I think a 60 is pretty close to my 48 in size so why not get the 72.