Well it sounds like everybody thus far is pointing you in the right direction. I did not know about the mooring / slip problem down there, so maybe I can point out a couple of other things.
Right now as everybody pointed out you need experience, you want your own boat so perhaps the best thing for you at this point is to look at something that you can trailer. I think you can go up to about 25' and still have a rig that can be pulled without permits and your own Semi-truck!
Maybe a catalina 22 or 25 like was already suggested. Get a swing keel, you will have a 2 foot draft and when you are done for the day you load it on the trailer and head to the house, park it in the driveway and you are done, no slip rental, no haul-out, no bottom paint, lots of plus points to consider.
Once you have some keel boat experience under your belt and you are ready to head out into to the clear waters around the Bahama's you will have the following.
1) A very good feel and knowledge of sailing. A keel boat (tiller steer) is damn good experience, you will become a sailor on that boat.
2) When you are struck with Bigger-itis and we all are, you will have a good idea of what you love on your little boat and what you want to change.
So far I think that you have gotten some really good advice, and nobody has been harsh or anything with you, it is a simple fact they are stating. When you get experienced you will tell others the same thing, just because it is such a great and enjoyable activity, however it can turn into a life and death struggle in a heartbeat. So nobody here is going to give you half assed advice they all have too much respect for the sport, the sea, and to Davy Jones, to give casual flippant advice.
Keep reading and learning, you will never know enough or know it all. That is a very good thing that you are doing. Reading, talking to fellow sailors, and actually getting out there and going sailing are what you need.
If you wonder about the money concerns others have raised it is with a reason they do so. We all own a hole in the water that we throw our money into. And the bigger the boat the higher the expense. Go to this address.
"Chip Ahoy" Homeport
Chip Bought a Catalina C22 named it Chip Ahoy! He spent about $2,500.00 on it initially and He has kept a running tally of costs and upgrades, the last time I checked he was over $20,000.00 and that is maybe in the past 5 years. So we have all felt the bite in our pocket book and want all new comers to understand the true cost involved.
Keep on you will get there! Good luck!