I don't think you can go wrong with fruit punch. I really enjoy it, and it seems like the season might be a bit longer, just gauging by times i've seen fruit available. I've also heard great things about guava. I visited Walter Zill and he took me for a long walk through his grove and reported that it seemed to have less issues with disease. That's more of an issue for me in central fl where we get hot and humid and don't always have the sea breeze to keep things moving. Guessing you already have Orange Sherbet, and the other obvious choices.
I grafted M4 onto a tree that froze back to the ground this winter, and hope the larger root system will get into production sooner.