C.C.
I live in Orlando and we like to go to The Villas of Grand Cypress. These are "condos" on a golf course and you can use the facilities at the main hotel (Hyatt RegencyGrand Cypress) which has an awesome waterfall/grotto pool w/ slides that my 6 year old just loves! I like the condos because it is quiet and has a full kitchen and nice bathroom w/ big tub. You should be able to get a good rate in July. The Hyatt Regency Hotel may have rooms too. there is more to do there with a game room and marshmallow roast in the evenings, you can borrow bikes and canoes, and there are several restaurants, but they are pricey.
As far as Disney hotels go, all are good. we like The Carribbean Beach Resort (considered moderately priced). They have a really nice pool w/ slides and a splash pad w/ slides. And the main pool is near a food court/game room. this resort is huge and spread out and each section has its own smaller pool but you can walk to the main pool which is in the midle of the resort. They have buses that will take you anywhere on Disney property at no charge. My girlfrend and I took our six year olds there last August and we had a blast! We also like the Port Orleans Resort. Different theme than Carribbean Beach, but very similar. You can also rent bikes and such at these hotels. You might want to consider getting a cabin at Fort Wilderness at Disney. these are nice and quiet and there is a pool and you can ride bikes and they have marshmallow roasts in the evening (w/ Chip n Dale!) and play a Disney movie outside when it gets dark.
I've heard good and bad about the Nick hotel. (Pricey, food not good, crowded). But kids love it and its all about them, isn't it!
Good luck and have fun!