While I can say that Dingos are not well regarded for trail construction (low clearance), it is hard to answer your question without knowing what you need to do with it.
Getting the correct piece of equipment is not the main concern. Its having the correct person running the equipment. Since you are asking the quesiton of what equipment to get, I will assume that you do not have an experienced trail builder with experienced doing mechanized construction.
HMBA does not own or rent mechanized equipment. When we need mechanized work, we hire professional trail builders who have their own equipment. I would strongly encourage you to consider this option.
If you still want to rent and run equipment, I would strongly suggest at least sending someone to learn how to build with mechanized equipment. There are a couple ways to do this. One is to take a mechanized trail building training class. I would look for training from the Professional Trail Builders Association
http://trailbuilders.org/They will likely have a mech training class at the professional trail builders conference in May.
If you can't find a class, the next option is to find a pro trail builder who is willing to let you volunteer for a week helping them build trails, in exchange for mechanized training and experience.
The training and/or experience will allow you to understand what piece of equipment will fit your needs and ensure that you know how to make efficient use of it when you get it.
