Nice! Where are you staying and which parks are you visiting?
We're staying on I-Drive, a place just opposite Wet 'n' Wild. Park-wise we are going to do pretty much everything (We're going for three weeks) although ironically the only place we aren't planning on going to is Wet 'n' Wild, which is the closest to us!
If you're interested, the way we've done the tickets is to do the Ultimate Discovery Cove package for Sea World and Busch, and at The Co-operative Travel on the high street they had a package which was for the Universal parks and Disney.
We go on the 29th of August so we're hoping it won't be too busy (after Labor Day at least).
Sounds like you're staying at Four Points as well then! Great choice if that's the case. Universal is a 15 minute walk, laugh off shuttles for that and do it at your own leisure. You have an I-ride stop literally at the front of the hotel, and that will take you anywhere up and down I-Drive (red) or to the bottom of I-Drive via Universal Blvd. (green). So for Seaworld for example, try and take a bus on the green route, as you'll get there much quicker (fewer stops, less popular route). Assuming you are at Four Points, and not another nearby hotel, then you'll also be able to use their free Disney shuttle service, which only stops at 1 other hotel, so it's pretty useful. They leave at 8.30 and 10am every morning, and pick you up from EPCOT at 6.30 and 9pm every evening. You have to book in advance, but the night before is normally plenty of notice.
It also sounds as though you're doing exactly the same parks, and with similar tickets (we got the Discovery package with Seaworld, Busch and Aquatica, but bought the Universal 14 day passes separately and then a 4 day 'Magic Your Way' Disney multi-park ticket with a 5th day free. May not be the case now, but worked out the best value for us at the time).