To the OP - All good advice so far. One other thing that hasn't been mentioned yet: I noticed you're a fellow Floridian and if you're going to be diving a lot from boats, one other consideration is the tank diameter. For very shortsighted reasons, many boats are rigged with tank stands that only support the 7.25"-diameter tanks similar to a standard Aluminum 80. This makes diving with most LP tanks and some of the largest HP tanks a PITA on those boats. The highest capacity tank you can get in the smaller diameter is the HP120, as far as I know.
Of course, if you're mostly diving the springs or Venice beach... the boat factor won't matter!
Of course, if you're mostly diving the springs or Venice beach... the boat factor won't matter!