We have been playing around with quotes for next year to give us an idea of when the best time to book, hasn't proved sucessful.
However regardless of when we go we got talking about doing three weeks at Disney and found that the majority of the time it's not that much extra in price for the extra week. Obviously you've got spending money etc but for the general cost of tickets and hotel it's not a lot different.
We did it in 2001 and stayed offsite and it seemed to go alot quicker than a two week holiday! lol
Is three weeks too much in the Disney bubble?