Video capablities first, but appreciate still image quality as well.

I have a K-5 and I'm extremely happy with pentax, but when video is your prime objective I should point you to the T3i because of the following.

The camera offers Full HD 1080p video recording, as well as a complete range of aperture, shutter speed, and ISO controls in video mode.

And if you want that film look of your footage you should keep the shutterspeed at 1/50 (which is closest to 1/48 which is 24p at 180 angle) Don't understand the last part?

Canon makes a great camera, and a world class video camera as well.

If it's video capabilties first, I would recommend the 600D. The 600D has so many cool things to make filmmaking easy and fun.

- snapshots of 2,4,6 or 8 seconds automaticly glued together, handy if you don't have an editor program in the neighberhood

- a lot of video modes to choose from.

- digital zoom 10x without really lose of quality

- and don't forget the swivel and tilt screen on the back for easy shooting in hard situations.

For photo taking I don't think they are that much seperated from each other, but don't forget those delicious L lenses from Canon. The plastic fantastic for just 100 euro's, the 85mm f/1.8 etc etc.

K-5 is a great camera, but the T3i is almost unparalleled in video performance.

While the sensor found in K-5 is highly regarded (similar if not essentially same SONY made sensor as ones found in Nikon D5100 and D7000), T3i is no chopped liver.

T3i has fold out monitor that is very useful when shooting video.  It has excellent photo image quality and your choice of "CURRENT" autofocus lenses are more compelling.  I'd save $300, get T3i and put the difference towards purchasing good lenses, including a wide-angle variety.  As for build quality, it is plenty good enough for most all consumers, unless you are a photo professional.

Pentax (and also Sonys) has sensor based image stabilization system, whereas Canon and Nikon have lens based image stabilization system.   While it may be more cost effective with sensor based IS since none of the lenses specifically have to have the feature designed into each lens, in reality, lens based systems are more effective, giving greater latitude of stabilization.

The Pentax K-5 is an exceptional camera for stills and for video.  And the price has dropped quite a bit from the original $1500.  Any K mount lens can be mounted and used on the camera, including legacy manual lenses.  It's a definite step up from the Rebel, which is more a competitor to Pentax's Kr camera.

i recommend this because i have a t2 and the quality is great, and it also have a lot of gadgets for you to make professional movies

if for video the canon would be better but for photos which is a main use of a camera k-5 is the best

There is no real competition to be made here... Until you move up to full-frame cameras, the Pentax will be the best possible choices. (I've owned the T3i, and am now shooting with the K-5)

The sensor is much better as well: Better ISO performance, higher max ISO, and the pixels are a bit bigger. The Pentax also uses less compression in its video files (Memory cards are cheap these days) and the body is also fully weather sealed... a big bonus, especially given the price.

This camera rocks when it comes to video as well as stills. You can also hack the firmware to shoot up to 100MB/S video.

-The image quality

-sensor stabilisation

-more focus points

-weather sealed

-Compact with compact lenses (limited series)

The K-5 is an amazing camera. However, I do not believe you will be able to get what you want from a DSLR. You can't really kill two birds with one stone, in this case. I would recommend you buy a high quality camcorder with camera capabilities. If video capabilities come first, I would not recommend a DSLR.