I was thinking of digging a pond like 50x75.And, like 5 feet on one end 15 on the other. With 10k to spend, what would be the best choice for equipment?A bulldozer?Mini ex? backhoe? Or something else? I may buy it dig the pond and resell. Or may keep it for expansion of my lawn care company. What would you buy and why ? And what would be the most efficient for this type of job?