Whats the cheepest dozer to use ? When I go to the sales its seems like size dosnt matter, if it does its that they get cheeper the Bigger they are. A D-9 seems like a heck of a deal compared to a D-4 for the same or more money. Id think even though it would use more fuel per hour a D-9 would also move a lot more dirt. It also seems like I have heard its easyer to do a good clean job on a bigger machine than a smaller one. So is it the parts for the bigger unit are killer? I sure noticed when I had my T=340 IH craweler that parts for it were a LOT higher than the same parts for a 340 tractor.