I agree that head to heads are more fun, and in keeping with the format of a cup competition, whereas PredictAddict's format for the World Cup is based on a league system. Doing both would work, use PA to submit predictions for the group matches, and then do our own head to heads in the last 16 or 8, depending on how many people join in. At the moment only yourself and LadyG have said yes, so I'm loathe to set anything up until we get at least a dozen takers, or else the head to heads just won't work...