Which of the following universities (or how many) should I apply to?

Wow. You definitely should be applying to all of your top schools. You are clearly very smart and will get into, if not all of them, most of them. I personally LOVE FLORIDA STATE! GO SEMINOLESS! haha but you are very set for college. Especially with all of your AP classes and all your honor societies. Keep your options open and apply to all of your top priority schools. Good luck :)