I'm taking blueprint this spring, and I have the bibles. Regardless of what BP teaches, I don't get the impression that it'll confuse my understanding of the concepts. It seems like what the bibles are teaching are fundamental strategies to attack all types of questions. These strategies are ones I never recognized thus far (as basic as they are to me now), so I have a whole new confidence in my ability to do better on the test than I have the first 2 times. If anything, I think the course (and tons of practice)will refine those strategies rather than refute them. But ask me again in April, and I'll verify my hypothesis.
Also, I've heard great things about LSAC superprep, mentioned above.