I've toured the Valor before, and will sail her on 10/1. She is a very nice ship and big. I am very active on this board and will post all highs and lows after I return.
As for your question, I would say go whenever. Since I live in South Florida, I can say the weather is perfect that time of year. Nov. 1 marks the end of "the season" and we usually celebrate outside with bbq's at the beach. For us locals, if we get a cold-front in Dec, our lows would be in the 60's and we break out the parkas. LOL!!
With the weather patterns over the past 2-years, it's really hard to predict what will be. I can say after living here my entire life, the weather is why people from the North come here starting Nov - April. In Nov and Dec, our highs are usually mid to upper 70's and lows in the 60's. Sometimes 50's.
Hope I helped,