It seems risky to only use one material source, because the other ones might have a better approach or problem solving technique. I'm planning to mix my books up. After going through the first few chapters in review books from different companies, I have found that Boondock's list is pretty good. I've seen it get posted in a few threads, so just keep looking for it.
Here's what my plan is (at the moment at least, because I keep changing it
)
Biology: EK text BR/PR passages
O Chem: BR text BR/PR passages
G Chem: BR text BR passages (like Bookdock's said, "best by far")
Physics: BR text BR/PR passages
Verbal: EK text EK/PR/BR/K passages
From what I've done so far (and what I've read in numerous threads at SDN), this really is the best combination of materials.