Rocket Languages so far is the best you can find I've tried other options before and I am just hooked to Rocket its easy to understand and with lots of material. I've purchased the french version and I couldn't be happier thats why I'd decided to get the Arabic.
This is the best course you will find. This is a very honest review I'd never review anything but I am just so happy I found Rocket it's worth every penny. I wish they come out with more levels for the Arabic course.