I'm about to begin a landscaping project at my house. I'll need to dig footings for about 400' of block wall, rip out existing blockwalls, and remove a concrete pool deck. I also have to regrade the whole yard. So i'm thinking of buying a used bobcat and a backhoe attachment for the job, but I know nothing about either. How large of a machine will I need to sufficiently run the backhoe? It needs to have auxilliary hydraulics to run the backhoe, correct? Does HF designate high flow, and what is the reason for the high flow? Thanks