Hiya
I bought an Kioti RX6010 cab tractor last year. The RX is a much newer tractor, newer engine. Best to try and sit in both. You would get an DK series with more HP than the RX. Best to pick what HP range you need and if there is an RX and DK in that power range sit in both. I was an automatic car driver only before I got that machine and I had no probs getting used to the gears. The cabin is nice and roomy, all fittings are well made. It's just really nice and easy to use.
Mike