I need an auger drive and rock bit (lots of weathered schist), and need recommendations on the brand. I'll probably only be drilling 30 or so holes, for now, but I want something descent. I am not inclined to hiring someone, either. I see a few brands, like Blue Diamond and McMillen, but I am not familiar with any. What is a good brand of auger drive and bit? I have a JD 332 to operate it, and will need a 12" bit. Thanks. john