We'll be staying for the first time in December. Based on my experience already, I'd suggest reserving your room as soon as possible at the best rate you can find now (versus waiting to see if another, better one comes along).
We called Uni reservations about a month ago and made our room reservation at the AAA rate (20% off). Originally, I had been planning to wait until this summer and I was hoping for (and still am!) stay more / save more rates. I'm so glad I didn't wait because I called the other day to just check and see what the best available is now for our hotel (PBH). The best available AAA rate is now $25/night more than it was when I booked.
I'm still going to keep checking for stay more / save more, but at least I know if they aren't offered, I have the best AAA rate available.