I have about 1.5 acres to mow. what mower would be the better choice: 1. JD z445 54" with 23HP Kawasaki Engine brand new 2. 2005 JD 737 MID Z-Trak with 54" and Kawasaki 23HP engine with only 80 hours. Both are selling for about $5200 Seem to me the 737 is a "commercial" mower so will probably last longer, but the age has me worried. I did verify by looking at the mower that it really only has 80 hours on it....the thing looks superb. Please let me know what is the better buy here.