Street fight takedown?

If someone is grabbing your t-shirt by the shoulder and the sleeve, what takedown is most effective? I tried a leg sweep (http://www.youtube.com/watch?v=yZ6GClPH-gw) similar to that, but he had his right leg back in a fighting stance and I was trying to sweep with my right leg as well since I have horrible balance on my left leg. It'd be appreciated if you could leave descriptive details (videos/pictures please). Thanks.