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!