I am going to replace my 42 inch craftsman with a ZTR. It is taking about 1.5 hrs to mow 1.5 acres. I would like to get down to about 40 minutes. How big of a machine would I need and how fast should it travel? The two models that I am considering are the new CountryClipper JAZee or the Hustler Fastrac. I am going to demo the countryclipper on Thursday. I dont know if I should by one of the more commercial units, or stick with the residential ones. I know that speed is a factor. Also, I noticed that on the "resi" cheaper models, the pump and wheel motor are one unit...This could be a servicing nightmare. Any input would be appreciated. Thanks.