You may already be on your way to South Florida, but just in case...
I wouldn't make a quick purchase on a dive computer. You can use your tables and bottom timer/watch. There are a lot of computers to choose from, many with features that are never used. They are expensive and the various models provide a substantial difference in NDL times. You may want a model that gives you an aggressive amount of NDL time, or you may want a model that is very conservative. Talk to your friends and do a lot of research and get the one that meets your needs/desires, not the one that has the best price.
If you rush, you may find yourself buying another one sooner that you ever thought you would