There are many great growers in South Florida, namely in Homestead. For Encyclia species I would highly recommend Ruben In Orchids. And I noticed very very healthy looking Catts at Carib Plants, but you'll have to check and see what species they have available. Generally speaking, I would recommend taking a Saturday to drive down to Homestead and stop at all of the Catt growers. Some of them are not always open, so I would call first and check for the day you would be planning to go. This link has a few vendors listed, but there are many more orchid growers in homestead, like Amazonia Orchids, R.F. Orchids, etc.
Redland Professional Orchid Growers