I'd opt for the T4i and the 40mm STM pancake lens and / or 18-135mm STM lens. This is the first Canon DSLR that will autofocus while doing video, and it is designed to work with the STM lenses which have relatively silent AF motors.
The T3i is not optomized with these lenses. It won't autofocus while doing video, so spending money on a AF lens for video is a waste, no matter which.
If you're an actor and making movies, you won't be using that AF anyway, as its not any better than pressing the shutter button and letting the camera hunt for focus. Everything is manual focus; they reason to get lenses that AF is if you plan on using the camera for stills as well.
I'll agree with others; get the T3i, get the Samyang lenses, learn to MF and expect a steep learning curve. If you're going to be doing just video work with the camera, start researching legacy lenses (Contax-Zeiss, Nikon AI, etc) as they are much cheaper than the modern Canon equivalents, and they work just fine with adapters for narrative video work.
When you are looking at lenses, you're not looking for what stills people look for. The 50mm f/1.8 has great IQ for its price, but its the worst lens Canon makes for manual focusing, which makes it hard to work with for video. The 40mm has the same limitation (tiny focus ring). That's where the Samyang lenses are so great