I think Canon are good enough. Lifepixel have some Canon's preconverted for sale I think.
The colour balance on video is something I have been wondering about too - the videos I have seen just use the in camera white balance without the channel swap which doesn't give the blue skies. I'm sure there must be a way to do it - even if it takes a long time.
I know they're definitely good at shooting IR photos since shutter speed is negotiable with still images, but that IR filter is so dark that I'd worry about shooting video since I like to shoot with a 180º shutter (1/50th sec shutter on 24fps), so even with bright sunlight, I'm curious to know if it's enough light for proper exposure..
OK you are talking about using an external IR filter - I don't think you could shoot video that way. I'm talking about an internal conversion for IR - you don't need super light sensitivity for that.