Congrats! Key West is a great location. I'm getting married there on October 17th. Have you looked at any locations down there? There are some really beautiful spots, I think it really depends on the type of wedding you plan on having and your budget. Let me know if you would like any vendor suggestions. I'm new to the website as well, so I don't know exactly how everything works, but I'm sure I'll figure it out.
Good Luck and happy planning!