If mowing is not your main job, then you want the Kioti it sounds like to me. A 2300 lb tractor is NOT an extremely heavy tractor, it is just that the others are so light. Great for the lawn, not so great for digging tasks. Don't forget you will be getting a 4 year new tractor warranty with the Kioti.
I noticed a huge increase in digging ability when I went from the Kubota L3400 to the Kioti DK35se. Both in the same horsepower class but the extra weight of the Kioti made a huge difference in the ability to dig with the FEL.
Whether position control matters to or not depends on what you do with the tractor, Box Blading or grading, it is real handy to have position control not quarter inching. Also if you mow with a mower without gauge wheels you will find that you will need to touch up your height every 15 to 20 minutes if you don't have position control as all 3pt's sag some over time and position control automatically maintains the proper position thru it's feedback mechanism.
Any of the three tractors would probably satisfy you, but it just depends on what you want to do with it as to which one is "best".