To the OP: You asked:
Would anyone have any suggestions on certifying agencies in which I should continue my DM and Instructor training with?
Assuming your profile information is correct, I would suggest NO agency "in which [you] should continue [your] DM and Instructor training with" because you need to just go out and dive and learn.
I know that one CAN start a DM program with very few dives (20 within the PADI system) and one can be certified as an instructor with as few as 100 dives (again, within the PADI system). But, just because one CAN do something does not mean one SHOULD do something.
I will freely admit that I am talking from my own personal experience and as is often the case, my personal experience significantly colors my advice -- so take it for what it is worth. That written, my advice is for you to get training from GOOD instructors from several different agencies -- and get a breadth of training and experience.
Take your Nitrox class from a NAUI instructor -- your Rescue from an SSI instructor -- your Cavern from TDI (since you live in Florida, you ARE going to take a Cavern class, are you not?). You may also want to experience "the dark side" and take GUE's Fundamentals which I can almost guarantee that you will find as a whole new level of training (compared to your OW and AOW from PADI).
Once YOU have experienced the instruction offered through offer agencies, then, perhaps, you can make your determination based on YOUR experience as to how you want to "Go Pro."
For the record, I've had instruction through PADI, NAUI, TDI, GUE, UTD and I decided to "Go Pro" through PADI. The primary reasons for becoming (and quite frankly remaining) a PADI Instructor were/are:
a. It IS the 800 pound Gorilla and students don't appear to question its legitimacy;
b. The materials (and instructor support) are quite good (even if I have to sometimes sigh at the silliness of some of it) -- the important thing is that the students DO obtain (and apparently retain) the crucial information about diving safety/safely;
c. The standards are quite good and appropriate (despite what "some" may think and say) for the level of diver education at each level; and
d. As an instructor, I have the freedom I need (although NOT as much as say a NAUI instructor may have) to teach my students to dive safely and comfortably.
Ya pays your money and ya makes your choice!