A number of years ago Eric Knudsen, The Village Landscape Manager, spoke to our garden club. The subject was plants for our area. For azaleas, he recommended George Taber azaleas and cautioned that Encore azaleas do not do well here.
Below is a link to Azalea Hill Nursery, an Ocala wholesaler. Click on "Varieties" to see pictures and learn which ones they find do well here. Scroll down on the home page to find the names of local retailers who sell azaleas they supply.
Home Page
Also helpful may be the azalea fact sheet from the U. Fl. Extension Service:
ENH37/MG019: Azaleas at a Glance