Here some things to consider. Will you be going back in the next year? If so, an annual pass would be your best bet. We have found that if you use it more than 7 days it is cheaper. Plus with all of the discounts they easily save you quite a bit of money. If you are only going this one trip, a 7 day park hopper plus pass might be your best bet. Those who want to go to the water parks can use the plus options, and they never expire so you can use them later should you not use them all. I don't care much for the lenghth of stay passes because we have found we don't really get our money's worth out of them. I know what ever option you choose you will all have a great time!
Laura