T3i

A T3i would be OK for video, but for the money, a much better choice would be the Panasonic DMC-GH2. It has been discontinued, but is still available. About $700 with the standard kit lens (it entered the market at $1000).

http://www.eoshd.com/content/4279/how-the-gh2-is-still-top-dog-for-video-quality