main diff with saltwater reels is corrosion resistant parts where you need them and being more sealed, so no water gets in the body. You still need to do more cleaning and rinsing after exposure to the salt so the more maintenance the longer it will last. Will freshwater reels work - absolutely. I've taken my 4000's (even 2500 sized) with me to Florida, Mexico, Antigua,...... with no long term problems but I would say everyday use in saltwater should warrant a purchase with saltwater features. Given the timeline I'd say Amazon would be your best bet. I have bought Piscifun and Kast King brands and for the money they are decent reels.
Probably looking more for a 7000, 8000 or larger reel then??