Beverly is easily one of the most under-rated late-season mangoes. Its productive, fungus resistant, and quite flavorful.
Some of the late season (mangoes ripening from late-July onward) varieties commonly available in Florida:
Kent (July-Aug)
Beverly (July-Aug)
Gold Nugget (July-Aug)
Valencia Pride (Aug)
Springfels (July-Aug)
Palmer (Aug-Sept)
Lancetilla (Aug-Sept)
Keitt (Aug-Oct)
Neelam (Sept-October)
Of those, I would recommend Beverly, Kent, Valencia Pride, Palmer, and Keitt.
Chok Anon is a mediocre mango that will sometimes set off-season fruit. NDM will do this also sometimes though and is light-years ahead in the flavor category. Some other SE Asian cultivars will do this as well. Almost all are better than Chok Anon.
Oscar, those are some pretty looking fruit. Looks like Rapoza inherited some good genes from its reported parent (Irwin).