I need some advice from the experts. I have a farm where I mow approx 5 acres of lawn and have horse pastures that need to stay clipped. I have been using a small John Deere tractor with a 6 foot finish mower for the lawn and an occasional bushhog pass for the pasture. I would like to get a mower that will cut my lawn fast (not too concerned about the look, just need it cut) and, as bonus, could run over the pasture every few weeks. I've located a 72" Dixie Chopper XXW4000 nearby with 500 hrs on one engine (20 hp Kohler) and 1000 hrs on the other. It has been owned by a homeowner for the past 7 years and he uses it basically the same way I would. It looks good in the pictures and seems to have been stored inside. Question is, does anyone have any experience with these? The DC dealer in town had nothing bad to say about them and the combined 40hp and seems nice, but I'm nervous about buying a gas engine (much less two). Should I hold out for a diesel or are these engines pretty reliable? Is there anything else I should be considering? By the way, the guy is asking $4500. Reasonable rate? Thanks for any feedback!