Another thought too.....
Have you considered the l2501? Don't know if kioti has a similar model that is still the same size tractor, just less HP.
It keeps you under emissions so a lot less crap to go wrong with the tractor.
The only two pto implement you listed that I see "could" warrant the added horsepower is the tiller and rotary cutter. But the 2501 will handle 5' in either of those.
So just how much tilling and bushhogging do you plan on doing in relation to everything else?
Normally I would advise to get the most HP you can afford.....or get the most HP in a given frame size.....but since the new emissions crap adding cost and complexity......I don't anymore. The 2501 is the same tractor as the 3901.....just less HP. So loader lift and pushing power, backhoe use, pulling stuff, etc it will be just as capable