These 'top commentaries' are from his class- Reformed Theological Research. It was a great class and I promise that after each class RHB did some good sales with the students!
It would really be worth it to get the mp3s of this course. It has book suggestions for many things as well as a step-by-step how-to for theological research. I believe from a scholarly perspective (not that MINE is worth
) this was the most important class I have taken in seminary.