Hey I live here in Miami and I wouldn't really recommend the gracie academy. It's not that it's a bad school but there are just some other really good BJJ schools in South Florida.
Att is a good idea, but I would recommend you got to the ATT in Coconut Creek, if you want MMA training
http://www.americantopteam.com/If you are looking for pure BJJ, Then I would train at Pablo Popovitch's School of which he has two locations here. They have alot of great bjj guys that constiently do well in Major BJJ events
http://www.bjjcenter.com/If you are looking for JKD training, then I would recommend Sifu Courtney White, he's a JKD instructor under Inosanto and a BJJ Brown Belt.
http://www.hybridmartialart.com/IF you want or need more ideas or just reviews from my personal experience living and training in miami for the last 6 years let me know.
