Need info on which mower to purchase. I can get a 2005 grasshopper 721 D2 21 HP Kubota diesel with 500 hrs for $8500 or a 2005 grasshopper 727K 27 HP Kohler gas with 500 hours for $6000.00. Both are in good shape maybe the 721 is a little better the owner kept it like new and it has the canopy. Also I know the guy with the 721 and found the 727 on craigslist. Which one. I cut about 15 acres, many hills.