Replying to Canon for video under $500

Title basically says it all, I have a bunch of EOS lenses already (28-70, 70-200, 16-35, 100mm, etc.) so I want to stick to Canon. I was looking at the EOS-M because it has the same sensor as the t4i and is only like $300, but wanted to ask NS. I have a stabilizer so I don't think the weird weight displacement with lenses is going to affect me much. How is the AF speed on it? Is it good for sports shots? I'm going to be using whatever camera I get mainly for video.