What are some tips on choosing and purchasing a good DSLR camera?

I'm slightly lost on selecting a DSLR camera and would appreciate some help!

First off, I need the camera to be capable of taking nice video, as I work in broadcasting and want to use the camera for lots of personal video work on my own time. Secondly, I want it to be a camera that will last a VERY VERY long time because it is an expensive purchase. Even though I'm very knowledgeable with profession video cameras and somewhat familiar with DSLR, it needs to be user friendly as this will be an introduction into the world of DSLR cameras for me!

I have already done a little research but I'm a little torn between whether or not I should go the Canon or Nikon route. What are the main differences between the two companies?

Some models I was looking at:

NIKON - D3100 (cheapest but would it do what I want it to do?)
NIKON - D5100
CANON - T2i
CANON - T3i (has flip out video screen which would be an asset)

What are the "ins and outs" of each of these cameras? Which one do you think would be the most suitable for me and why?

Also, what are some accessories you recommend I purchase (other than a tripod, SDHC card and case)?

I appreciate all the help!

The Nikon D5100 and Canon T3i/600D are the newest dSLR's in that price range

Here is how the sensors of those cameras perform

http://www.dxomark.com/...nd2)/Canon

If you are interested in shooting in low light, the D5100 is probably the best choice

Visit the Nikon and Canon websites for more research

First know your brands and you've apparently done some research which is good. That' a lot more than I can say about so many who write here are are just to lazy to do any research at all expecting us to do it for them.

These two brands, Canon and Nikon are the only two chosen by professionals world wide for many good reasons. The models you mention are all excellent.

There really are no "outs" to any of them. They are all excellent and all will do what any dslr will do.
The real question is, are you capable of operating these cameras on anything but full auto? If not I'd suggest you learn. Operating a dslr camera on full auto is a waste of money.

You really need to decide, which is more important to you, video or still.

And if you favor video, you would be much happier with a true camcorder.

This video, released shortly after the Canon 5D ll came out, wowed everyone.

http://blog.vincentlaforet.com/2008/10/10/without-further-ado-reverie/

But it wasn't easy to make, and besides the camera, they used about 20K worth of lens's.

Fhotoaces, comment about the D5100, is only about it's performance as a camera, and not as a video cam.

As you are talking about lasting a "VERY VERY long time", the series of cameras you have suggested, will last a long time, but are updated with the "new, new" version on a less than yearly basis.

If you are in for the long haul, invest in a "full frame" camera, that has a video option, like the Canon 5D ll or the Nikon D3s.

The only thing that will last a VERY, VERY long time, will be the lens's you chose to go along with your camera body.

(just a random note, Canon makes awesome video-cams, that they use for movies released to the "Big-screen" and Nikon makes… None.)

ps, lots of batteries!

The Nikon D5100 or Canon T3i are the best in your list. When looking at a camera's movie quality, also don't forget it's audio quality.

The D3100 only records in Mono… And you can't add on a stereo mike.
The T3i and D5100 also record in Mono, but you can add on a stereo mike.

Frankly, I reckon a Handycam is a whole lot more user friendly than a dSLR when it comes to recording movies… Not to mention better audio recording capability (5.1 channel etc.). A dSLR is primarily best at taking still shots… But it's your choice. I'm a Canon fan, but I'd say that the D5100 definitely has the edge in regards to movie recording.

I recommend you read the in-depth reviews below to help you make the right choice…
http://www.dpreview.com/...ikond5100/
http://dpreview.com/...oneos600d/
http://www.cameralabs.com/reviews/Canon_EOS_600D_Rebel_T3i/
http://www.cameralabs.com/reviews/Nikon_D5100/
http://www.dcresource.com/reviews/canon/eos_rebel_t3i-review
http://www.dcresource.com/reviews/nikon/d5100-review

good luck

p.s.you'll need a fast Class 10 SDHC or SDXC card… And lots of card capacity when recording movies. For example (on the T3i) 11 mins of Full HD movies uses 4GB.