I would also suggest TouringPlans (
https://touringplans.com) touring plan feature
. It really gives you an idea of wait times and how to optimize time in parks. I have used it extensively and find it really helpful.
Out of curiosity, I created a couple of plans for USF for your date with a few rides. One with Express Pass and one without. In both cases the start time is 11am. Wait times would obviously vary depending on the time of the day but considering you have both parks pass you are most likely going to be there the whole day.
USF without Express Pass, start at 11am, ride in this order (to minimize wait times):
Revenge of the Mummy - 38 min
Despicable Me - 1h 9 min
Transformers - 1h 22 min
Escape from Gringotts - 1h 28 min
USF with Express Pass, start at 11am, ride in this order (to minimize wait times):
Revenge of the Mummy - 7 min
Despicable Me - 13 min
Transformers - 14 min
Escape from Gringotts - 14 min
That being said, $500 is still $500