I'm applying BDCP too.. and have wodererd the same thing.
Go to http://www.bupers.navy.mil
there's a link to new PRT standards.
I think you should plan to get at least a "good low." Since the PRT and your physical are factors that will finalize your package, your PRT should be as good as possible. "Good Low" is better than in "in-prt" test to take when you report to OCS, however, my recruiter said that he couldn't submit my FINDOCS if I got anything lower.