If you're a Florida resident, check the Florida Resident Seasonal pass before you buy. It's about $100 less than the DVC Discount AP.
I don't have the exact blackout dates in front of me, but they are basically Easter Week, early June to early August, and then just before Christmas (like the 23rd) to just after New Years (2nd-3rd).
If you can handle those blackout dates, the Florida Seasonal Pass is a real money-saver!