Two things:
Fish;
On the new Marlins, at least, there are two painted options; "Cape Gray" & "Harbor Blue." The rest are colored gelcoat choices.
tellch00;
In either case, whether gel or paint I think keeping a new boat at a marina with no freshwater option is something to ponder.
You will not be able to flush your engine(s) or clean it up after a day taking salt spray. Apart from the visual aspect of salt on the hull, you are looking at premature wear & corrosion from salt and the elements. I would personally be uncomfortable in that scenario.
Good luck whichever way you go and enjoy your new ride!