Based off of the little research I've done so far, it looks like I could afford a t3i or a t4i. I suppose I might prefer a t3i because of the cost but if the difference is really that dramatic for a t4i, I could technically do that too. Is the video going to really be that dramatically different?

I really want to be able to get a good quality camera like one of the two I mentioned, but from what I've seen online, lenses cost quite a bit. Down the road, I'll be able to afford those, but at the moment all I could probably do is the camera. Are the shorts I intend to make going to suffer for not having the availability of different lenses? The shorts will mainly be in a dorm and on a jogging path so there is some movement involved.