Just to thrown a few bones out there (other classes), World GT is way more popular here in Florida. They have a few RCGT (Touring cars), You forgot Oval car or truck.Then there is Legends and the new car from RJSpeed the LTO (oval car). F1 down here died.
The best advice is go where you want to race and see what classes they race.
Team Epic/Trinity -Michael Bruce Hobbies-Team CRC ,Kimbrough Products GForce and RJSpeed.
WGT-R, GT Racing USA (17.5 foam),RJSpeed- Legends &Spec Mod, MudBoss and 386 RaceWay.