I am struggling with the task of choosing my first pair of free diving fins. I dive in Florida, often in the partially overhead enviroments of the freshwater spring caverns along the Suwannee and Sante Fe Rivers. Should that dictate the choice of one type of fin or another? Is there any real quality difference between Omer, Picasso, Esclapez, etc.? How does one determine which fin fits best when no local dive shops carry free diving fins, let alone a selection that would allow comparing how each footpocket fits your foot? Will distributors ship you a pair of fins and neoprene socks to try the fit, and allow you to return them after trying them on, assuming you don't use them in the water?