Hi Tom,
I'm so glad you caught this thread. I know you are about ready to start your project too. BTW, how is your barn coming? I have not heard about it lately. Do you have any pictures?
About my 55hp Kama, it sure did a great job over and above the normal CUT use. I'm glad I got the size I did because anything smaller would have been a real challenge for some of the work it had to do. You can see I have done a lot of modification to make it more versatile though. I think I posted before that with the work I've done for the house and barn project, let alone all the other stuff I've done on the road, trail, food plot and camp projects, it's paid for itself a couple times over now. I must have gotten a really good one.
A Komatsu D65 is a pretty good sized bulldozer, quite a bit larger than yours, isn't it? I'm surprised your bulldozer is not doing what you want. Maybe you have some giant rocks, granite or trees in the way? I'd sure like to hear what's going on at your property.