now that your needs are expressed, i would 1st say go M series over MX. have had both, and would never go back. not sure what the increment price jump is from 6040 to 7040 but may be worth considering. same frame/engine, just more hp & 7040 has limited ft differential. the jump from 7040 to 85/9540 is big and a considerable price jump. you already know that Kubotas are a bit light on their feet, so whatever you get, consider some form of rear ballast. and strongly recommend the hyd. shuttle option, the fel & 4wd goes w/out saying. sounds like you are on the right track & wish you the best in the considerable investment. go M series & you won't be sorry.