Dean has a crappy rep, they're a pilot mill for foreign contracts. It is cheap though. Last time I saw their planes they were in pretty crappy condition and
TMB can be a pain to train in...there's long taxis and that's going to eat up Hobbs time. Not to mention the foreign accents on the radio, improper or non-existent communications in the training area and down right chaos at times. Teaching in the area scared the crap out of me.
American flight academy is another and they have a good chief flight instructor who gives it his best. The short time I was there gave me mixed feelings about the quality of training other instructors were providing, but then again it could be student shortcomings or failure to take an active part in their training and actually study. They will work with you to keep your cost down, which is great for the student.
NS Aviation is located in North Perry airport. I know their prices have crept up over time, but their quality is very good. The owner runs a good school there and having worked there 4 years myself, I feel comfortable recommending you go there.
Endeavour flight training at OPF is also very good, not sure about their prices since its been a while. But their equipment is newer..so that's usually costlier.
Other option is to work with an independent CFII. There are some in OPF (myself included) that can work with you and keep costs lower. A good instructor who can remember what it's like to be in your shoes can give you tips on how to train to avoid high ground school cost and how to prepare on your own so that you progress steadily is something you should always look for.
If you have questions or want to know more about the independent CFII route, PM me.