fall 08 had a minimum impaction score of 10.1 but my guess is the score will continue to increase with each semester. shoot for at least a 3.5 in you 5 prereqs and last 30 units and 85+ on your teas.
i heard a grant just expired reducing the amount of students accepted each semester from 80 to 60. impaction cutoff for fall 08 admission was 10.4 my guess is that it will only go up for future semesters. but if you end up on the wait list (top 5) ...