I know the feeling...in the history of our town, the schools have started the Wednesday after Labor Day (at least for the 30 years I've been here!). This coming fall, they will be starting the Friday after Labor Day instead. Now i'm getting paranoid that the following year they will change it to before Labor Day! We had too many problems after taking our oldest DD out of school for a Disney vacation last time, we were hoping to avoid problems by going the last week in August next year.
August is not my first choice, but since we need to go when school is out, and we were able to get a good price for the last week, we could not pass it up. If we could pay the price for an earlier week in August, we probably would have considered going during April vacation. (I think the prices were comperable for April vacation and summer vacation.) April won't be as hot/humid and it isn't during hurricane season either.
I'll just keep hoping for the best and hope your district will make up their minds about starting dates for you!!!