Interesting choices to compare. The Kioti 3510 has waaayyyy more loader capacity than the kubotas you mention, or the wimpy deere. And the 3510SE has all those nice optional features like telescoping rear 3-pt links, linked-pedal hydrostat, etc. The Exhaust DPF seems quite reliable on them, people are up over 1000 hours now without issue.
I cant wait to buy my 3510SE. Don't have the wife on board yet, since my current tractor still kicks arse too.