Originally Posted by hokiealumnus
Its refresh rate isn't as fast as you're after, but the yongnuo 500EX (~$120 on amazon) can sync up to 1/8000 if you have a camera with that kind of shutter speed. I'm considering that one for my 70D.
Just remember - not just any 500EX (or any off brand for that matter) will work because of the Sony / Minolta altered hot shoe (almost everyone else uses a different hot shoe). You have to make sure that if you buy an off-brand flash that it has the correct mount. I didn't find a 500EX from a quick search that were compatible, but I might have missed something.