As far as public schools in duval, I think I'd say Raines, and Sandalwood may be the best right now. I've heard rumors that Ribault will have a pretty good team too.
I didn't mean to hijack the thread though. Fleming Island, during the Webb era, and at the beginning of the Hall era were some really physical, disciplined, tough teams. I've always admired them, because I never thought they had that great of athletes, but could play with anybody. I watched all of their clashes with First Coast, and they would lose, usually on some fluke play late in the 4th qtr. FC seemed to be the luckiest team alive for a while, but they were extremely talented.