This is what I did last year. I booked a room only at the AAA rate through Disney. The reason I do this is it is the most flexible option with the least cancellation penalties. I think you can cancel up until about two weeks out with no penalty at all. Then I waited for the deals. When one comes along, I then book it through my AAA agent and cancel the first one. No problem. If no deal comes along and I want the full package, I'll just book it through AAA.
The rules are quite different for packages. You have a AAA cancellation fee in addition to Disney cancellation fees. Last year those fees started at 45 days out. So it's not as flexible as a room only.