You are going in August. That means, to me anyway, pool is important. To me you cannot go wrong with the
Disneyland Hotel. The Neverland Pool with water slide, hot tub area, and a separate "quiet" pool are top notch Disney. I believe this hotel is starting a rehab in January 2008 so make sure you check into whether it'll all be fully operational by August.
If budget is at all a concern, then the Paradise Pier is no slouch either. The rooms are bright and cheery and it feels very "fresh" though the overall theming could be goosed a bit. Its pool is, well, not so great, but it has a marvelous slide and a nice hot tub. I thought it was a great option overall.
I won't bore you about the Grand Californian since you didn't ask. Its also a marvelous resort on a par with the great theming that you find at WDW.
Lou-Ann: Grand Californian is the closest Disney hotel to the both parks. Some one in an
ECV/scooter was staying in a room right next to me so its very "scooter-friendly."
I'm a Disney resort fanatic - both at DL and at WDW. Have a great trip!