September is a great time to go. The weather will be cool and the kids will be in school, so it won't be too crowded. What days are you going? If you'll be there Sept. 30 you'll be able to go to the food and wine festival at Epcot, which is well worth going to.
I don't really have any accomodation information, except that staying on Disney property is best (especially if you're only going to do Disney and not any other Orlando attractions) and Lake Buena Vista is also nice, but stay away from Kissimmee.
The 4-day parkhopper pass will be your best bet. If you get tired of one park you can leave and go to another in the middle of the day. Like everyone said, there really isn't a way to buy discounted tickets unless you want to listen to a timeshare sales pitch, but AAA can perhaps get you a slight discount and if you are a military family you can get discount tickets at the base travel agent.
The best restaurants are at Epcot in the World Showcase. The restaurants at the Animal Kingdom lodge are also wonderful.
There's some good information at http://www.allearsnet.com/
Hope this helps. Let us know if you have more specific questions.
Post Edited (06-24-05 08:20)