We just closed on a BCV resale and are waiting to be put in "the system" so we can make our first ressie. Planning our first trip home in September. I called yesterday, using the member # from our proposed purchase at SSR, to inquire about availability. We are planning on a 2 BR and I was told that lots of space remained at BCV, BWV, VWL and SSR. I don't think you will have any trouble getting a ressie once your resale closes, actually, you will probably still have your choice of several resorts.
We go in Sept. because the weather is still warm enough to fully enjoy the pools and water parks but mostly just to avoid crowds. The park hours are shorter but without any waiting that is never a problem and leaves more time to enjoys pools and the resort. The crowds were so light last year that during the entire week the Fast Pass machines were only turned on once and that was on Labor Day. When the kids get older and involved in more activities it will be harder to take them out of school but right now we think it is worth it.