The Sheffield Drum Record is very good. My reference is a CD-R called Drum Improvs done by a guy in St. Louis a few years ago recorded live to hard disk of himself playing a huge drum set. It's not perfect but is far more dynamic than any other drum CD I've ever heard, and the soundstage is huge. I don't know if he is still willing to sell copies as he made it sound like a bit of chore for him to do, but anyone interested can contact me offline for his info.