AGGGGHHHHH!
Nemrod doesn't like backplate setups in warm water. I do. You may. Renting one from Silent World is a superb suggestion -- try the gear yourself and see what you think!
I never said that, I have no jackets or conventional BCs for myself. I either dive a wing or nothing and rarely a old horsecollar. I have never owned a jacket, "poodle jacket" or any such BC ever. I began diving a wing circa 1976. I use a wing in warm water or cold water but I am quite likely in warm water to not use any wing or BC at all. I have been an active diver since 1966 and over the years I have seen styles come and go. The wing/BP type BC is the most efficient design and is optimal for proficient divers and serious technical types. I noticed for example, on my weeks down in the Keys, I actually saw some people on the boats using wings. Up north on the Mighty O the DM commented that this was the first time every diver on his six pack had a wing/BP.
Nonetheless, I will stick with what I said concerning the OP. I think everybody has given her some good information to work with and hopefully she will get a good setup that will work for her.
N