I know you are really looking at Ft.Lauderdale/Miami areas, however i would strongly recommend Orlando Flight Training (OFT - Run by Cabair) who are based in Kissimmee Airport Orlando & Air Orlando based in Orlando Executive Airport (KORL).
I obatined my PPL in the UK but i went initially to OFT (previoulsy Euroflight) to obatin my IMC & Night Rating. This school will with out a doubt give you the best experience of being in Florida whilst you fly & have an excellent flight training program (the instructors are very friendly and their style of relaxed flight training is very encouraging), however at the time (1999) their selction of aircraft were limited. Im sure that this has all changed since Cabair got involved and from what i have heard from other people has changed for the better!!
Air Orlando in Executive Airport are only FAA approved, but the flight instruction is excellent, their aircarft are immaculate and well kept, and although a small school in comparrison to some 'sausage factory's' they really make an effort in one-to one training. You might want to consider going down the FAA route and converting later (its not as difficult at PPL stage as opposed to Commercial ) and if this is the case i really cannot go on about this school enough. Since 1999 i continually return to Air Orlando for hour building, sight-seeing (the airport has good facilities and is a good base for seeing most of florida). The website is :
www.flyairorlando.com
EMail Trudy , she is very helpfull and can give you suggestion on accommodation, car hire etc.
Good Luck on your flying, Florida is a great place to fly..........