Crepe Myrtle for shade: This site may help you, lots of really good information
Florida Trees For Sale | The Tree Center. I purchased three from a nursery on 441 in the Ocala area and I cannot remember their name, if I locate it I will pm it to you. We also purchase from a small and excellent nursery which is just past Market of Marion. They have a very attractive appearance in their front yard, small building with pots and decorative stuff outside. They really know their stuff, they will find you what you need and plant it. This past year they found us a small grapefruit and also planted it for us. It has done extremely well.