College, FlightSafety and Mesa
Do you have a degree? If not, you might consider earning a B.S. in a flight program and/or other field at a college that is tied in with flight training. I'm one of the apparent minority here who likes an Aeronautical Science degree. You'll need a four-year degree in something to be competitive and you will need it eventually.
While you're in the Florida mindset, try checking out
FlightSafety Academy in Vero. I worked there ten years ago. It offers a good, and expensive, program. I will vouch for the program. Some of the high quality personnel with whom I worked are still there. FSI would be a direct competitor to Pan Am and Comair.
Another idea is
Mesa Airlines Pilot Development. I worked there, too. I did not care for the company at all but I liked the program. You earn a two-year degree in Aviation Technology and all your ratings. The degree is from an
accredited junior college, meaning that you should be able to transfer most, if not all, of your credits to a four-year school. The real deal for grads is the possibility of interviewing with Mesa Airlines at 300 hours. A program like this is a sort of double-edged sword, though. You earn your ratings but not a CFI, so if you're hired but don't go to class right away and are placed in a hiring pool, you're stuck for work. Not too many places hire fresh, 250-300-hour pilots without CFIs, so you might find that you will have to earn your CFI, and spend more money, to work and keep flying. Comair grads have to get their CFIs, so they have a fallback plan.
I would say two things about Gulfstream, in this order: (1) Get as much input as possible about the place, its ramifications and all that its ramifications imply. A good place to start is this message board. (2) After receiving input, consider your decision about going there very carefully. We've had quite a few discussions about Gulfstream, including comments from one or two disaffected Gulfstream types.
Military is a great choice if you can find a slot. You will get great training. It takes some ability to get through UPT and fashion a military career. The airlines know that and like it. The military requires a commitment of many years, but at the end you will get to go to the head of the hiring line. Military pilots are one of the best airline job networks around. You have to remember, though, that your membership in the military is your career and flying is your job. Leaving the military for full-time flying will be a career change.
Above all, choose your source of training carefully. Take the career consultants' spiels with a big grain of salt. Some of them can make you feel completely unworthy and beg to be let in, when the truth is you only need to write a check to be admitted.
Hope this helps. Good luck with your choice.