I am a big proponent of building instead of buying, but that is because I am rather particular about what features I want (shocking, eh?) and quality levels.
Prices have gone down quite a bit IMO, but asking what it costs to build a house per square foot is like asking what a pair of shoes costs - too many factors to give an acurrate answer. If you would be willing to post more details like square footage, construction type, finish level etc. there are many people on the board who could give you a better ballpark figure of current prices.
There are some good contractors around, and some not so good ones. Make sure your contractor is licensed in Florida, thoroughly check their references, complaints against them, and examples of their work.
Also, look at their feet - dirty/well worn workboots will build you a much better and cheaper house than flip-flops w/ no sock tan line!