Hi, I am new to the lawn care business and am looking to line up 10 to 15 lawns to mow this season with the average lot in my area being .5 acre. I will be buying a mower soon and have been going over alot of diffrent options and know that a commercial grade mower is definitely going to hold up better, but was just wondering what the diffrence is. Besides the engines what other diffrences are there in the construction of the mowers. I have seen for example 50" Cub Cadet mowers at the local Tractor Supply for $3,000. They also sell the same size mower for $4,000 with the heavy duty label on it, but I did not see any diffrence. Hopefully some of the veterans on this site could help me out on my decision making. I am looking to spend the least to get the most. There are alot of options in my area as far as commercial brands go: Exmark, Dixon, Skag, Bad Boy. My price range is $3,500-$5,000 and would like a 48"-52" ztr. Thanks in advance for any advice.