"Have you ever been out on the street in the spring or fall and noticed people wearing everything from shorts & T-shirts to full coats with hats & scarves, all apparently in comfort? Well, things are no different underwater. This comfort is highly variable among individuals depending on such factors as percentage of body fat, age & tolerance to thermal discomfort. Other determinants, like how many dives a day over how many days you are planning, are also important. When you ask "What wetsuit should I wear?, you'll get answers ranging all the way from "just a bathing suit" through "7mm full."
The question is better asked: "What water temps can I anticipate at my destination?" You'll receive a pretty accurate answer to this, and then can decide what's best for you based on your personal thermal comfort needs.
It's always a good idea to come thermally prepared, just in case."
That having been said, expect early-Nov Coz scuba temps of ~81F +/- a degree. Remember that as the number of dives increases, the demands on thermal reserves become substantial. No matter how warm the water may feel at first, as long as it's below body temperature (~98.6F/37C) ), it's going to sap body heat.
Personally, I like being toasty and thus err on the side of heavier neoprene. If get too warm, I simply let some water into the suit.
Have fun.
DocVikingo