If a school wants you to retake the DAT you could just tell them that you will retake it. If one of the other schools you interviewed with (those that are OK with your scores) accepts you in December then you don't have to worry about retaking it. You could then call a school that wanted you to retake the DAT and tell them you were accepted somewhere else and ask them to make a decision based on your current scores. If you don't get into any of the schools this December then you might want to consider retaking it. I guess one risk to doing this is that most of the spots will start filling up this December and if you don't get in by then you might be a little pressed for time to retake the test and be reevaluated by the committees. Might want to keep up on the DAT material a bit just in case you are forced into retaking it. Just my opinion.
Take care.
EcoRI