Regrettably, very few respondents answered the OP question and, as normal, people need to justify what they use.
Birdlover, your decision to rent something is a good one. At least you will get a feel for what you need. Check around to see if your neighbors have a BH as well. Some of them may have the same tasks, and similar soil you have. They can be a great resource to get advice or get the job done. That is what worked for me. It was one of the guys I know a few miles form me that has a BH who talked me out of getting one. He came over, completed what I needed done, and it was a bargain. Plus I made a good friend.
Good luck!