Do you have the "Magical" deal? If not, you should seriously check it out! We are staying std view Poly the week before Labor Day for the same price as POR preferred with an estimated 20% discount. Really amazing deal and it includes a waterpark day. Just look for the August 2015 discount thread for more info. I lived/worked down in Orlando in the summer, and like others have said, the skies pretty much open up every afternoon and 'dump the ocean' on Orlando mixed with some heat lightening. It very hot/humid, but also lots of AC. Just be prepared with water, take breaks, etc.
We are going to try Typhoon Lagoon. Coming from MN now, we get enough snow in the winter, LOL. Just going for the total tropical vibe this trip to I guess? Up until recently I probably would have picked Blizzard Beach because my kids aren't super adventurous either and I had heard it has good tot areas, but DD6 is too tall for the little tot area now, so just ogling at the lazy river, a few slides, and the edge of the giant wave pool.
Also excited about the revamped Nanea pool that is coming to the Poly, resort days for sure. Have fun sat SAB and happy planning!