Don't have any experience with the DK65 although I have had my eye on them for a good while. Seems like a lot of tractor for the money. In your case; I am not so sure 60 pto hp is gone do so well with a 15' brush hog. The rumor mile has it that Kioti is coming out with a DK85 next year. Exactly the hp class machine I was considering and the hp you will need to drive a large cutter like you want. I will be waiting and watching .