Re: Rod for Turks and Caicos
I would also recommend a stiff 8 or a 9 for saltwater if you were to get another rod. A 7/8 is not far from your current 6wt, and you don't want to buy a rod just for one specific use case on one trip. You will want a rod you can then use after that in more saltwater situations. While a 7/8 is not bad for some saltwater, it will be a little undergunned if you plan to do some windy waters or larger game fishing (such as surf casting for stripers) later on.
A 6wt and an 8wt (or a 6wt and a 9wt) will be able to cover pretty much all species you will ever be likely to target as a casual fisherman.