You have until the 3rd week to decide, right? So if enrollment is tight, grab a place during lottery and then drop it after you realize that you hate the class/hate the prof/have no time. If enrollment is not tight, then just sit in.... The good thing about the enroll-then-drop is that sometimes the prof doesn't even know you're not taking the course, cause who looks at a roll sheet after the first week anyways?

I think 3 classes is a goodly amount if you're writing your BA, though. :D