DSLR cameras for shooting videos?

I'm looking for a DSLR to shoot video on.
I've looked at the Canon Rebel T3i and the Nikon D3100, D90, and D7000
I can't choose!
I'm looking for something that I can rack focus with, something that will look amazing, and have good audio. Pretty much I'm just asking for your preference on the video option on these cameras.
Help!

Added (1). The reason for my interest in DSLR's is that I do intend on taking pictures as well. I want to invest in something that is kind of the best of both worlds.

I'm a Canon guy so I recommend the t3i - an excellent offering. Canon's attention to detail and their obsession with quality impresses me so I stay with this company.

The t3i, as you may know, also takes an external microphone to improve your audio. All on board microphones are very small and their quality isn't as good as a professional external mike. I recommend Shure and Sennheiser - I've used them both for years and they're about the best out there.

For shooting video hand held I also recommend this little gem. A friend in California and I both have this device and we both just love it.
http://www.amazon.com/...004HD3G6Q/

You may want to read this before you spend a dime

http://www.luminous-landscape.com/reviews/camcorders/cam-cam.shtml

Here is what the Nikon D7000 is capable of shooting video wise in low light

Me, I would buy a video camera if my goal was to produce videos

If you want rack focus you have to get a Sony SLT unless you want to do a lot of work. The Sony SLTs do rack focus right in the camera and it's a breeze. They are also the only DSLRs (technically they aren't DSLRs but they look and operate exactly the same as one) that you can operate the video function while looking through the viewfinder and the only ones that provide continuous autofocus in movie mode. They all have external mic inputs too so need to worry about audio.

From least expensive to most expensive:
Sony SLT a33
Sony SLT a35
Sony SLT a55
Sony SLT a65
Sony SLT a77

I really don't understand why people buy DSLR cameras for video

for the same price as one of those cameras, you can get an actual video camera that blows any DSLR out of the water videowise

The current best Canon cameras for video are:
- C300 (US$ 16, 000)
- 5D Mark II with Magic Lantern firmware (US$ 2, 147 at Amazon)

For more information:
- Canon EOS C300: http://cinemaeos.usa.canon.com/
- 5D Mark II: http://www.amazon.com/...001G5ZTLS/
- Magic Lantern firmware: http://magiclantern.wikia.com/wiki/FAQ