This is mine and my teammate's Extreme Martial Arts Demo Reel that I recently shot and edited together, featuring various styles of martial arts, weaponry work, tricking and fight choreography. It may not be everyone's cup of tea, but I thought I'd still go ahead and share it on the forum :) http://www.youtube.com/watch?v=MXDsV0YAO08 (Shot on a Canon 600D with 18-55mm Kit Lens and 50mm f/1.8, and edited using Adobe Premiere Pro & After Effects).
As a few others have said, have a look at the Yongnuo models - I've got 2 of the YN-560 II models and had them for nearly year now with very little hiccups. Battery life can be a burden at times, but I just tend to use good-quality re-chargeable batteries and it works a charm! Never used any other flash models, but I've been told that the quality of the Yongnuo flashes is not much different to the Canon's - very powerful too! :)