I'd go with the Canon t3i. It'll give you the best versatility and creative control for the lowest price (around 600), BUT don't get it with the kit lens. Try to get it with a better lens, 18-135 IS for example. A lot of camera stores have deals like half off a lens when you buy a body.
Then get some sort of stabilization (this is the next most important thing for video, other than the camera). I love glidecams but you're looking at another $400 for this. The same with tripods. Don't go cheap on stabilization, but shop around. I've seen really good results simply from a pistol grip and an LCD viewer (around $100 for both). The viewer will also help you see how well you are focused, especially when its bright out. The last thing you want is to get into Premiere and realize that you were slightly out of focus all day.
So, in short:
For around $800, I recommend the t3i with a better lens, with a pistol grip and lcd viewer.
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