Depending on how much you love Harry Potter and how much you must do the new HP expansion at Uni you can save a lot of money if you did Islands of Adventure on the 9th and added the HHN ticket to your IoA ticket. Being a weekday you will be able to do all of IoA in the day, get there at opening and there won't be any lines for most of the morning, and then you can do Uni while doing HHN. All the rides, except Potter and ET, will be open for HHN. If you do most everything during HHN you won't need to spend the money on another ticket for Uni (except if you really want to do Potter 2.0).
Just a thought.